Randy, Also change the formula of the fuel mix. Rockets use a formula designed to burn not explode. Also, it terms of shaped charges, a hubcap packed with explosive and covered with sandbags makes a great shaped charge. You should see what it does to refrigerators and old cars ;-0 Jonathan > -----Original Message----- > From: psn-l-request@.............. > [mailto:psn-l-request@................. Behalf Of Randy > Sent: Saturday, July 23, 2005 5:24 AM > To: psn-l@.............. > Subject: Re: Digest from 07/22/2005 00:01:12 > > > Hi All, > > I came into the middle of this so not sure who to direct this to. > I gather > there is a need for some small explosions. I was recently looking at this > site http://www.nakka-rocketry.net/index.html and on it there are some > recipies for building rocket motors with sugar and potasium nitrate in PVC > tubing. Just eliminate the nozzle. > > Randy > > ----- Original Message ----- > From:> To: > Sent: Saturday, July 23, 2005 2:00 AM > Subject: Digest from 07/22/2005 00:01:12 > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 1 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: Bruce Bolt has died > > From: Larry Cochrane > > Date: Fri, 22 Jul 2005 02:50:29 -0700 > > > > All, > > > > I just read on a newsgroup that Bruce Bolt has passed away. I had the > opportunity to > > meet him at a local conference a few years ago. > > > > Regards, > > Larry Cochrane > > Redwood City, PSN > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 2 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: Re: Bruce Bolt has died > > From: Dave Nelson > > Date: Fri, 22 Jul 2005 20:25:53 +1000 > > > > At 02:50 AM 22/07/2005 -0700, you wrote: > > >All, > > >I just read on a newsgroup that Bruce Bolt has passed away. I had the > > >opportunity to meet him at a local conference a few years ago. > > >Regards, > > >Larry Cochrane > > >Redwood City, PSN > > > > ohhhh wow :( what a sad loss to family, friends and associates, > > my condolences to all > > > > I met Bruce in the mid 1990's when he visited Otago > university, Dunedin, > NZ > > where I did my geology degree. Bruce did a couple of guest speaker talks > > ... one was on the response of the golden gate bridge to quakes > > > > It was so good to meet the man that really brought seismology home to me > > during the late ' 70's and ' 80's through his publications. > > > > thanks Bruce > > > > Dave Nelson > > Sydney, Oz > > > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 3 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: RE: Modified sound card and datalogging and geophones > > From: "James Hannon" > > Date: Fri, 22 Jul 105 07:28:13 CDT > > > > To do any kind of survey at all you need many impacts so it is hard to > imagine a gadget that beats a brute swinging a sledge for portability and > multiple strikes. > > > > A couple of years ago I was sitting in the St Louis airport and > noticed a > slow vibration of my seat that almost felt like an earthquake. Looking out > the window I saw that they were breaking up a runway to replace it. There > was a machine that lifted a huge weight and dropped it on the concrete. It > would slowly move along dropping the weight every six inches or > so. I was a > couple of hundred feed away and could still feel it. The machine was > breaking up reinforced concrete about 2 feet thick. > > That would have made one heck of a survey! :) > > > > Jim Hannon > > > > > > ---------- Original Message ---------------------------------- > > From: "Doug Crice" > > Reply-To: psn-l@.............. > > Date: Thu, 21 Jul 2005 16:47:11 -0700 > > > > >A sledgehammer is operated by swinging it through about a 250 > degree arc, > > >presumably by a muscular associate. If you were to replace it with a > weight > > >drop, you would need to drop it many meters to approximate > this amount of > > >energy. Thus, your weight needs to be accelerated somehow. There are > units > > >that attach to vehicles with large rubber bands. They are cocked by > > >electric or hydraulic devices. See photos on > > >http://www.giscogeo.com/pages/giscosei.html > > > > > > > > > > > >We would like to make a significant improvement in energy output. You > could > > >make a better hammer and plate, but probably not twice as good. > > > > > > > > > > > > I have considered flywheel operated devices. You could spin up a > flywheel > > >with a battery operated drill and then couple the energy into > the ground > > >somehow, though there are strange forces going in strange > directions when > > >you suddenly stop a spinning flywheel. > > > > > > > > > > > >Doug Crice http://www.geostuff.com > > > > > >Wireless Seismic http://www.wirelessSeismic.com > > > > > >12996 Somerset Drive phone 1-530-274-4445 > > > > > >Grass Valley, CA 95945 USA fax 1-530-274-4446 > > > > > > > -- > > Jim Hannon > > http://www.fmtcs.com/web/jmhannon/ > > 42,11.90N,91,39.26W > > WB0TXL > > -- > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 4 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: Re: Modified sound card and datalogging and geophones > > From: BOB BARNS > > Date: Fri, 22 Jul 2005 10:42:24 -0400 > > > > > > > > ChrisAtUpw@....... wrote: > > > In a message dated 22/07/2005, royb1@........... writes: > > > > > > Doug, > > > For a "ground-pinger": make a fitting to attach a > bicycle pump to > > > the > > > screw cap on a large plastic (one liter?) soda-pop > bottle. Bury the > > > bottle down to the neck (or deeper) and pump until the bottle > > > fails. (I > > > don't know how much pressure these things will stand.) > > > > > > Hi Bob, > > > > > > You could fit a car tyre type valve into the cap and use a foot > > > pump. I suspect that the bursting point will be quite temperature > > > sensitive. It might be OK to pump it up to 100 psi or more > and then jab > > > the bottle with a knife on a long handle? > > > > I agree that the bursting point would be temperature sensitive but I > > can't guess if that would be disabling. The ground temperature at one > > location should be relatively constant for successive shots although > > different location would see different temperatures. > > A jab with a knife would probably result in a slower release of > > energy (than the bursting of a bottle) and hence a smaller peak pulse. > > > > > > > > This scheme meets your criteria except the "multiple > impact" and > > > possibly the "ping instead of thump" but it's hard to beat for > cheap. > > > A glass bottle might be more ping-like but would leave a > hazardous > > > residue. > > > > > > That would need an awful lot of pressure and flying glass is very > > > dangeous. > > > > I agree. > > > > > > > > > > Another scheme:introduce a standard spark plug into a > pop-bottle > > > just > > > below the neck. Run two wires (thru a rubber stopper in > the neck or > a > > > screw cap) into the bottom of the bottle into an inch or so of > > > water..... > > > > > > Umm? How about put 1/2" of water in the bottom, a couple > of wires in > > > through the cap, add a teaspoonful of calcium carbide, shake > and wait a > > > few minutes. Stand well clear and put a spark between the > wires to fire > > > the gas mixture? > > > > > > This sort of device is used in agricultural bird scarers and they > > > produce a bang which can be heard for a mile or so. It might well be > > > possible to adapt one for seismology? > > > > The carbide idea has some charm (I have a carbide cannon) but careful > > control of the acetylene-air ratio would be necessary to achieve a > > detonation. Electrolysis of water automatically insures stoichiometry. > > > > > > > > Alternatively, equip your self with some balloons, fill them with > > > acetylene + oxygen and apply a glowing fuse or cigarette? I > > > suggest setting the gas torch burning with the correct flame > shape, wipe > > > out the flame and then fill the balloon? A local school kid did this > > > with one of the 3 ft weather balloons in is father's garage many years > > > ago. He removed all the nearby windows for about 100 yards..... > > > > Again, stoichiometry would require careful control of gas-air ratio. > > Also, balloons are harder to bury than bottles. > > I can see that a 3 ft balloon is a good choice for window removal. > > Bob > > > > > > > > Regards, > > > > > > Chris Chapman > > > > > > > > > __________ NOD32 1.1175 (20050721) Information __________ > > > > > > This message was checked by NOD32 antivirus system. > > > http://www.eset.com > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 5 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: RE: Bruce Bolt has died > > From: "Kareem at HeyJooJoo" > > Date: Fri, 22 Jul 2005 08:22:10 -0700 > > > > I unfortunately never had the chance to meet him but would have > liked to. > I > > believe all of our libraries owe quite a bit of gratitude to him for his > > contribution of writings and research. > > > > I recalled when the Newcastle quake hit Australia some time > following our > > Loma Prieta Quake, he was interviewed about how rare it was to > see a M5.6 > > quake in that part of Australia. He referenced how his parents or > > grandparents only talked of one strong quake in Australia. I > guess that's > > where he grew up as a child? > > > > > > Kareem > > > > -----Original Message----- > > From: Dave Nelson [mailto:davenn@................ > > Sent: Friday, July 22, 2005 3:26 AM > > To: psn-l@.............. > > Subject: Re: Bruce Bolt has died > > > > At 02:50 AM 22/07/2005 -0700, you wrote: > > >All, > > >I just read on a newsgroup that Bruce Bolt has passed away. I had the > > >opportunity to meet him at a local conference a few years ago. > > >Regards, > > >Larry Cochrane > > >Redwood City, PSN > > > > ohhhh wow :( what a sad loss to family, friends and associates, > > my condolences to all > > > > I met Bruce in the mid 1990's when he visited Otago > university, Dunedin, > > NZ where I did my geology degree. Bruce did a couple of guest speaker > talks > > ... one was on the response of the golden gate bridge to quakes > > > > It was so good to meet the man that really brought seismology home to me > > during the late ' 70's and ' 80's through his publications. > > > > thanks Bruce > > > > Dave Nelson > > Sydney, Oz > > > > > > __________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email PSN-L-REQUEST@.............. with the > body of the > > message (first line only): unsubscribe See > > http://www.seismicnet.com/maillist.html for more information. > > > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 6 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: Re: Modified sound card and datalogging and geophones > > From: ChrisAtUpw@....... > > Date: Fri, 22 Jul 2005 13:46:30 EDT > > > > > > -------------------------------1122054390 > > Content-Type: text/plain; charset="US-ASCII" > > Content-Transfer-Encoding: 7bit > > > > In a message dated 22/07/2005, royb1@........... writes: > > > > The carbide idea has some charm (I have a carbide cannon) but careful > > control of the acetylene-air ratio would be necessary to achieve a > > detonation. Electrolysis of water automatically insures stoichiometry. > > Hi Bob, > > > > Agreed, but have you worked out how long it would take to get > sufficient > > H2 and O2 by electrolysis and the number of amp hours required? > > You would need inert electrodes in the water + lime soda? > > > > You know the volume of the bottle and hence the volume of > oxygen. You > > now need to weigh out the right amount of CaC2, tip it in the > bottle and > wait > > till it stops fizzling. It would probably be good enough? > > > > > Alternatively, equip your self with some balloons, fill them with > > > acetylene + oxygen and apply a glowing fuse or cigarette? I > > > suggest setting the gas torch burning with the correct flame shape, > wipe > > > out the flame and then fill the balloon? > > > > Again, stoichiometry would require careful control of gas-air ratio. > > Also, balloons are harder to bury than bottles. > > > > > > > > The way my mind works, I was thinking of using sausage shaped balloons > blown > > up inside a thin cardboard tube. If you light the acetylene flame and > adjust > > the O2 to get a cylindrical blue centre, you have the correct > gas ratio. > You > > then push the flame onto a cold flat surface to snuff it out > and use the > > nozzle to fill the balloon? > > > > This should work OK. It gets around having to have a license to > handle > > explosives. > > > > Regards, > > > > Chris Chapman > > > > -------------------------------1122054390 > > Content-Type: text/html; charset="US-ASCII" > > Content-Transfer-Encoding: quoted-printable > > > > > > > > charset=3DUS-ASCII"> > > > > FONT-FAMILY:=20= > > Arial"=20 > > bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7> id=3Drol= > > e_document=20 > > face=3DArial color=3D#000000 size=3D2> > > In a message dated 22/07/2005, royb1@........... writes:> >> style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px > solid"><= > > FONT=20 > > style=3D"BACKGROUND-COLOR: transparent" face=3DArial > color=3D#000000=20 > > size=3D2> The carbide idea has some charm (I have > a carbide > ca= > > nnon)=20 > > but careful> >
control of the acetylene-air ratio would be necessary > to=20 > > achieve a
detonation. Electrolysis of water automatically > insure= > > s=20 > > stoichiometry.Hi Bob,> >> >Agreed, but have you worked out how long it > wou= > > ld=20 > > take to get sufficient H2 and O2 by electrolysis and the number of amp > hours= > > =20 > > required?> >You would need inert electrodes in > the water > +=20= > > lime=20 > > soda?> >> >color=3D#000= > > 000=20 > > size=3D2> You know the volume of the bottle and > hence= > > the=20 > > volume of oxygen. You now need to weigh out the right amount of > CaC2, tip > it= > > in=20 > > the bottle and wait till it stops fizzling. It would probably be good > enough= > > ?=20 > >> > > >
> Alternatively, equip your self > with some=20 > > balloons, fill them with
> acetylene + oxygen and apply a glowing > fus= > > e or=20 > > cigarette? I
> suggest setting the gas torch burning with the > correct= > > =20 > > flame shape, wipe
> out the flame and then fill the=20 > > balloon?
Again, stoichiometry would require > carefu= > > l=20 > > control of gas-air ratio.
Also, balloons are harder to bury > than=20 > > bottles.> >The way my mind works, I was thinking of=20 > > using sausage shaped balloons blown up inside a thin > cardboard tube. > If= > > you=20 > > light the acetylene flame and adjust the O2 to get > a cylindrical=20 > > blue centre, you have the correct gas ratio. You then push > the flame > on= > > to=20 > > a cold flat surface to snuff it out and use the nozzle to > fill the=20 > > balloon?> >> >This should work OK. It gets > around having to > h= > > ave=20 > > a license to handle explosives.> >> >Regards,> >> >Chris Chapman> > > > -------------------------------1122054390-- > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 7 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: Re: Modified sound card and datalogging and geophones > > From: "James Hannon"> > Date: Fri, 22 Jul 105 12:56:29 CDT > > > > Just about any mixture of acetylene and air or oxygen will > detonate. Under > the right conditions pure acetylene will detonate. Last year I filled a > small (6 inch dia filled) ballon with acetylene and oxygen with > the correct > mixture and set it off. You really do not want to be anywhere near when it > goes off! My ears were ringing for hours and I could feel the > pressure wave > push my pant legs back. Problem is that I am not sure how you would couple > this explosion into the ground. Put on the surface the force would just > reflect off the ground. So it would have to be buried. There is also a > safety issue -- any tiny static charge on the ballon would set off the > explosion and easily hurt someone. > > Jim Hannon > > > > ---------- Original Message ---------------------------------- > > From: ChrisAtUpw@....... > > Reply-To: psn-l@.............. > > Date: Fri, 22 Jul 2005 13:46:30 EDT > > > > >In a message dated 22/07/2005, royb1@........... writes: > > > > > >The carbide idea has some charm (I have a carbide cannon) but careful > > >control of the acetylene-air ratio would be necessary to achieve a > > >detonation. Electrolysis of water automatically insures > stoichiometry. > > >Hi Bob, > > > > > > Agreed, but have you worked out how long it would take to get > sufficient > > >H2 and O2 by electrolysis and the number of amp hours required? > > > You would need inert electrodes in the water + lime soda? > > > > > > You know the volume of the bottle and hence the volume of oxygen. > You > > >now need to weigh out the right amount of CaC2, tip it in the > bottle and > wait > > >till it stops fizzling. It would probably be good enough? > > > > > >> Alternatively, equip your self with some balloons, fill them with > > >> acetylene + oxygen and apply a glowing fuse or cigarette? I > > >> suggest setting the gas torch burning with the correct flame shape, > wipe > > >> out the flame and then fill the balloon? > > > > > >Again, stoichiometry would require careful control of gas-air ratio. > > >Also, balloons are harder to bury than bottles. > > > > > > > > > > > >The way my mind works, I was thinking of using sausage shaped balloons > blown > > >up inside a thin cardboard tube. If you light the acetylene flame and > adjust > > >the O2 to get a cylindrical blue centre, you have the correct > gas ratio. > You > > >then push the flame onto a cold flat surface to snuff it out > and use the > > >nozzle to fill the balloon? > > > > > > This should work OK. It gets around having to have a license to > handle > > >explosives. > > > > > > Regards, > > > > > > Chris Chapman > > > > > > > > -- > > Jim Hannon > > http://www.fmtcs.com/web/jmhannon/ > > 42,11.90N,91,39.26W > > WB0TXL > > -- > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 8 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: RE: Modified sound card and datalogging and geophones > > From: "Wayne Francis" > > Date: Fri, 22 Jul 2005 11:22:23 -0700 > > > > Just as an aside, some of these contraptions sound a little like my > > son's potato cannon. Along with the spark, it used Aqua-net hairspray as > > the volatile substance (would auto starter spray work?). Pretty good > > bang to fire that potato. They used PVC, but build one out of 2 inch > > steel pipe, give it a squirt, set it off with a sparker (they were > > experimenting with piezo, ie. barbeque striker). Might work. > > Wayne Francis > > Ojai, CA > > > > -----Original Message----- > > From: psn-l-request@.............. [mailto:psn-l-request@............... > > On Behalf Of BOB BARNS > > Sent: Friday, July 22, 2005 7:42 AM > > To: psn-l@.............. > > Subject: Re: Modified sound card and datalogging and geophones > > > > > > > > ChrisAtUpw@....... wrote: > > > In a message dated 22/07/2005, royb1@........... writes: > > > > > > Doug, > > > For a "ground-pinger": make a fitting to attach a bicycle pump > > to > > > the > > > screw cap on a large plastic (one liter?) soda-pop bottle. Bury > > the > > > bottle down to the neck (or deeper) and pump until the bottle > > > fails. (I > > > don't know how much pressure these things will stand.) > > > > > > Hi Bob, > > > > > > You could fit a car tyre type valve into the cap and use a foot > > > pump. I suspect that the bursting point will be quite temperature > > > sensitive. It might be OK to pump it up to 100 psi or more and then > > jab > > > the bottle with a knife on a long handle? > > > > I agree that the bursting point would be temperature sensitive but I > > > > can't guess if that would be disabling. The ground temperature at one > > location should be relatively constant for successive shots although > > different location would see different temperatures. > > A jab with a knife would probably result in a slower release of > > energy (than the bursting of a bottle) and hence a smaller peak pulse. > > > > > > > > This scheme meets your criteria except the "multiple impact" > > and > > > possibly the "ping instead of thump" but it's hard to beat for > > cheap. > > > A glass bottle might be more ping-like but would leave a > > hazardous > > > residue. > > > > > > That would need an awful lot of pressure and flying glass is very > > > dangeous. > > > > I agree. > > > > > > > > > > Another scheme:introduce a standard spark plug into a > > pop-bottle > > > just > > > below the neck. Run two wires (thru a rubber stopper in the neck > > or a > > > screw cap) into the bottom of the bottle into an inch or so of > > > water..... > > > > > > Umm? How about put 1/2" of water in the bottom, a couple of wires > > in > > > through the cap, add a teaspoonful of calcium carbide, shake and wait > > a > > > few minutes. Stand well clear and put a spark between the wires to > > fire > > > the gas mixture? > > > > > > This sort of device is used in agricultural bird scarers and they > > > produce a bang which can be heard for a mile or so. It might well be > > > possible to adapt one for seismology? > > > > The carbide idea has some charm (I have a carbide cannon) but careful > > > > control of the acetylene-air ratio would be necessary to achieve a > > detonation. Electrolysis of water automatically insures stoichiometry. > > > > > > > > Alternatively, equip your self with some balloons, fill them with > > > acetylene + oxygen and apply a glowing fuse or cigarette? I > > > suggest setting the gas torch burning with the correct flame shape, > > wipe > > > out the flame and then fill the balloon? A local school kid did this > > > with one of the 3 ft weather balloons in is father's garage many years > > > > > ago. He removed all the nearby windows for about 100 yards..... > > > > Again, stoichiometry would require careful control of gas-air ratio. > > Also, balloons are harder to bury than bottles. > > I can see that a 3 ft balloon is a good choice for window removal. > > Bob > > > > > > > > Regards, > > > > > > Chris Chapman > > > > > > > > > __________ NOD32 1.1175 (20050721) Information __________ > > > > > > This message was checked by NOD32 antivirus system. > > > http://www.eset.com > > > > __________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email PSN-L-REQUEST@.............. with > > the body of the message (first line only): unsubscribe > > See http://www.seismicnet.com/maillist.html for more information. > > > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 9 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: RE: Bruce Bolt has died > > From: "felipe luevanos luevanos" > > Date: Fri, 22 Jul 2005 18:27:16 +0000 > > > > I am truly sorry, do you know when this happened? > > > > Felipe Luevanos. > > > > >From: Larry Cochrane > > >Reply-To: psn-l@.............. > > >To: psn-l@.............. > > >Subject: Bruce Bolt has died > > >Date: Fri, 22 Jul 2005 02:50:29 -0700 > > > > > >All, > > > > > >I just read on a newsgroup that Bruce Bolt has passed away. I had the > > >opportunity to meet him at a local conference a few years ago. > > > > > >Regards, > > >Larry Cochrane > > >Redwood City, PSN > > > > > >__________________________________________________________ > > > > > >Public Seismic Network Mailing List (PSN-L) > > > > > >To leave this list email PSN-L-REQUEST@.............. with the body of > the > > >message (first line only): unsubscribe > > >See http://www.seismicnet.com/maillist.html for more information. > > > > _________________________________________________________________ > > Express yourself instantly with MSN Messenger! Download today it's FREE! > > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 10 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: Re: Modified sound card and datalogging and geophones > > From: Karl Cunningham > > Date: Fri, 22 Jul 2005 17:31:44 -0700 > > > > Hi All -- > > > > My son used to set off 2-liter soda bottles by putting some dry ice in > them > > and then screwing on the cap. It takes about 5 minutes for it > to build up > > enough pressure to burst the bottle, but less if the bottle is > in contact > > with the ground. I would try doing this by augering a hole in > the ground > > (or use a post-hole shovel) just large enough to fit the soda > bottle, then > > covering the hole with something solid (concrete blocks) just after the > cap > > has been screwed onto the bottle. This may be the least > expensive method > > and should produce a relatively high-frequency content. The report from > > the bottle exploding in air can be heard for over a mile and I > can attest > > that it annoys neighbors and attracts police attention. Examining a > bottle > > after the explosion, it appears the explosion happens quite > quickly. The > > bottle is opened starting from the bottom like petals of a flower, with > the > > cap at the center. > > > > I have tried blowing out an acetylene torch then feeding the gas into an > > empty container, then igniting it with a spark plug. Have gotten mixed > > results. Not sure why. > > > > I have done the "potato cannon" using ether, available at auto-parts > stores > > in aerosol cans as engine-starting fluid. After setting them off dozens > of > > times though, the results are far from uniform. Probably due to > > poorly-controlled fuel-to-air ratio. > > > > Regards, > > Karl Cunningham > > > > > > --On Friday, July 22, 2005 1:46 PM -0400 ChrisAtUpw@....... wrote: > > > > > In a message dated 22/07/2005, royb1@........... writes: > > > > > > The carbide idea has some charm (I have a carbide cannon) but careful > > > control of the acetylene-air ratio would be necessary to achieve a > > > detonation. Electrolysis of water automatically insures > stoichiometry. > > > Hi Bob, > > > > > > Agreed, but have you worked out how long it would take to get > > > sufficient H2 and O2 by electrolysis and the number of amp hours > > > required? You would need inert electrodes in the water + > lime soda? > > > > > > You know the volume of the bottle and hence the volume of oxygen. > > > You now need to weigh out the right amount of CaC2, tip it in the > > > bottle and wait till it stops fizzling. It would probably be good > > > enough? > > > > > >> Alternatively, equip your self with some balloons, fill them with > > >> acetylene + oxygen and apply a glowing fuse or cigarette? I > > >> suggest setting the gas torch burning with the correct flame shape, > > >> wipe out the flame and then fill the balloon? > > > > > > Again, stoichiometry would require careful control of gas-air ratio. > > > Also, balloons are harder to bury than bottles. > > > > > > > > > > > > The way my mind works, I was thinking of using sausage > shaped balloons > > > blown up inside a thin cardboard tube. If you light the acetylene > flame > > > and adjust the O2 to get a cylindrical blue centre, you have the > > > correct gas ratio. You then push the flame onto a cold flat > surface to > > > snuff it out and use the nozzle to fill the balloon? > > > > > > This should work OK. It gets around having to have a license to > > > handle explosives. > > > > > > Regards, > > > > > > Chris Chapman > > > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 11 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: Re: Modified sound card and datalogging and geophones > > From: BOB BARNS > > Date: Fri, 22 Jul 2005 21:06:00 -0400 > > > > > > > > ChrisAtUpw@....... wrote: > > > In a message dated 22/07/2005, royb1@........... writes: > > > > > > The carbide idea has some charm (I have a carbide cannon) but > > > careful > > > control of the acetylene-air ratio would be necessary to achieve a > > > detonation. Electrolysis of water automatically insures > stoichiometry. > > > > > > Hi Bob, > > > > > > Agreed, but have you worked out how long it would take to get > > > sufficient H2 and O2 by electrolysis and the number of amp hours > required? > > > You would need inert electrodes in the water + lime soda? > > > > Salt water and carbon electrodes would work BUT, as often happens, > > the devil is in the details. I calc. that to get 1 liter of > > oxy-hydrogen mixture reqires 10 amps for 14 mins. I think this is > > unworkable. > > The CaC2 scheme should be much better. > > > > > > You know the volume of the bottle and hence the volume of oxygen. > > > You now need to weigh out the right amount of CaC2, tip it in > the bottle > > > and wait till it stops fizzling. It would probably be good enough? > > > > > > > Alternatively, equip your self with some balloons, fill > them with > > > > acetylene + oxygen and apply a glowing fuse or cigarette? I > > > > suggest setting the gas torch burning with the correct flame shape, > wipe > > > > out the flame and then fill the balloon? > > > > > > Again, stoichiometry would require careful control of > gas-air ratio. > > > Also, balloons are harder to bury than bottles. > > > > > > The way my mind works, I was thinking of using sausage shaped > > > balloons blown up inside a thin cardboard tube. If you light the > > > acetylene flame and adjust the O2 to get a cylindrical blue > centre, you > > > have the correct gas ratio. You then push the flame onto a cold flat > > > surface to snuff it out and use the nozzle to fill the balloon? > > > > I like this method except that it requires lugging around acetylene > > and oxygen tanks. Perhaps the balloons could be filled at a central > > site and then taken into the field. > > Another thought pertinent to all these schemes: the top of the gas > > container should be some distance below ground level and dirt packed > > above the container. This provides directing the force of explosion > > into the ground rather than letting it be expended into the air. This > > is called "tamping". See > > http://www.mektonzeta.com/archive/explosives.php > > Bob > > > > > > > > This should work OK. It gets around having to have a license to > > > handle explosives. > > > > > > Regards, > > > > > > Chris Chapman > > > > > > > > > __________ NOD32 1.1176 (20050722) Information __________ > > > > > > This message was checked by NOD32 antivirus system. > > > http://www.eset.com > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 12 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: Re: Modified sound card and datalogging and geophones > > From: BOB BARNS > > Date: Fri, 22 Jul 2005 21:10:59 -0400 > > > > Wayne, > > I suspect that the propellant in the hairspray is a hydrocarbon such > > as propane. > > A propane-air mixture does not detonate; rather it burns rapidly like > > gunpowder. This would provide a longer seismic pulse than the > > detonation of hydrogen-oxygen or acetylene-air mixtures. > > Bob > > > > > > Wayne Francis wrote: > > > > > Just as an aside, some of these contraptions sound a little like my > > > son's potato cannon. Along with the spark, it used Aqua-net > hairspray as > > > the volatile substance (would auto starter spray work?). Pretty good > > > bang to fire that potato. They used PVC, but build one out of 2 inch > > > steel pipe, give it a squirt, set it off with a sparker (they were > > > experimenting with piezo, ie. barbeque striker). Might work. > > > Wayne Francis > > > Ojai, CA > > > > > > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 13 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: RE: Bruce Bolt has died > > From: Mariam Kaba-Marshall > > Date: Fri, 22 Jul 2005 18:18:49 -0700 (PDT) > > > > --0-297853181-1122081529=:48544 > > Content-Type: text/plain; charset=iso-8859-1 > > Content-Transfer-Encoding: 8bit > > > > I am truly sorry. > > > > Mariam Marshall > > > > felipe luevanos luevanos wrote: > > I am truly sorry, do you know when this happened? > > > > Felipe Luevanos. > > > > >From: Larry Cochrane > > >Reply-To: psn-l@.............. > > >To: psn-l@.............. > > >Subject: Bruce Bolt has died > > >Date: Fri, 22 Jul 2005 02:50:29 -0700 > > > > > >All, > > > > > >I just read on a newsgroup that Bruce Bolt has passed away. I had the > > >opportunity to meet him at a local conference a few years ago. > > > > > >Regards, > > >Larry Cochrane > > >Redwood City, PSN > > > > > >__________________________________________________________ > > > > > >Public Seismic Network Mailing List (PSN-L) > > > > > >To leave this list email PSN-L-REQUEST@.............. with the body of > the > > >message (first line only): unsubscribe > > >See http://www.seismicnet.com/maillist.html for more information. > > > > _________________________________________________________________ > > Express yourself instantly with MSN Messenger! Download today it's FREE! > > http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/ > > > > __________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email PSN-L-REQUEST@.............. with > > the body of the message (first line only): unsubscribe > > See http://www.seismicnet.com/maillist.html for more information. > > > > > > > > MariamKMarshall > > > > > > __________________________________________________ > > Do You Yahoo!? > > Tired of spam? Yahoo! Mail has the best spam protection around > > http://mail.yahoo.com > > --0-297853181-1122081529=:48544 > > Content-Type: text/html; charset=iso-8859-1 > > Content-Transfer-Encoding: 8bit > > > > > >I am truly sorry.> >> >Mariam Marshall> >
felipe luevanos luevanos > <felicaribe5@...........> wrote:I am truly sorry, do you know when this > happened?
Felipe Luevanos.
>From: Larry Cochrane >
>Reply-To: > psn-l@..............
>To: > psn-l@..............
>Subject: Bruce Bolt has died
>Date: Fri, > 22 Jul 2005 02:50:29 -0700
>
>All,
>
>I > just read on > a newsgroup that Bruce Bolt has passed away. I had the
>opportunity > to meet him at a local conference a few years > ago.
>
>Regards,
>Larry Cochrane
>Redwood City, > PSN
>
>_______________________________________________ > __________ > _
>
>Public Seismic Network Mailing List > (PSN-L)
>
>To leave this list email > PSN-L-REQUEST@.............. > with the body of the
>message (first line only): > unsubscribe
>See http://www.seismicnet.com/maillist.html for more > > > information.
______________________________________________ > __________ > _________
Express yourself instantly with MSN Messenger! Download today > it's FREE! >
http://messenger.msn.click-url.com/go/onm00200471ave/direct/01 > /
_ > _________________________________________________________
Public > Seismic Network Mailing List (PSN-L)
To leave this list email > PSN-L-REQUEST@.............. with
the body of the message (first line > only): unsubscribe
See http://www.seismicnet.com/maillist.html for more > information.> >color=#ff40ff>MariamKMarshall href="http://www.alex1mariam1.yahoo.com/">> DIV>___ > _______________________________________________
Do You Yahoo!?
Tired > of spam? Yahoo! Mail has the best spam protection around >
http://mail.yahoo.com > > --0-297853181-1122081529=:48544-- > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 14 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: Re: Modified sound card and datalogging and geophones > > From: Gordon Couger> > Date: Sat, 23 Jul 2005 00:47:57 -0500 > > > > Bob, > > > > A propane air mixture will detonate if the mix is just right it > > is used as fuel in detonation engines. The fuel to air ration is > > lot narrower and the conditions more critical than hydrogen or > > actetyene. > > > > Gordon > > > > BOB BARNS wrote: > > > Wayne, > > > I suspect that the propellant in the hairspray is a hydrocarbon such > > > as propane. > > > A propane-air mixture does not detonate; rather it burns > rapidly like > > > gunpowder. This would provide a longer seismic pulse than the > > > detonation of hydrogen-oxygen or acetylene-air mixtures. > > > Bob > > > > > > > > > Wayne Francis wrote: > > > > > >> Just as an aside, some of these contraptions sound a little like my > > >> son's potato cannon. Along with the spark, it used Aqua-net hairspray > as > > >> the volatile substance (would auto starter spray work?). Pretty good > > >> bang to fire that potato. They used PVC, but build one out of 2 inch > > >> steel pipe, give it a squirt, set it off with a sparker (they were > > >> experimenting with piezo, ie. barbeque striker). Might work. > > >> Wayne Francis > > >> Ojai, CA > > >> > > > > > > > > > __________________________________________________________ > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > To leave this list email PSN-L-REQUEST@.............. with the body of > > > the message (first line only): unsubscribe > > > See http://www.seismicnet.com/maillist.html for more information. > > > > > > > > > > > > > > .------ ------ ------ ------ ------ ------ ------ ------ ------ ------. > > | Message 15 | > > '------ ------ ------ ------ ------ ------ ------ ------ ------ ------' > > Subject: Re: Bruce Bolt has died > > From: Col Lynam > > Date: Sat, 23 Jul 2005 16:38:22 +1000 > > > > This is a multi-part message in MIME format. > > --------------090006060605090302030801 > > Content-Type: text/plain; charset=us-ascii; format=flowed > > Content-Transfer-Encoding: 7bit > > > > Dear Psn BB readers > > I'd appreciate any references to any obituary for Bruce Bolt. > > I'd like to compose a small one to place in the newsletter for Aust > > earthquake Engineers Soc. > > > > Thanks all.. > > col lynam > > volunteer observor, QUAKES group, ESSCC centre, Uni of Queensland, > Australia > > > > Dave Nelson wrote: > > > > > At 02:50 AM 22/07/2005 -0700, you wrote: > > > > > >> All, > > >> I just read on a newsgroup that Bruce Bolt has passed away. I had the > > >> opportunity to meet him at a local conference a few years ago. > > >> Regards, > > >> Larry Cochrane > > >> Redwood City, PSN > > > > > > > > > ohhhh wow :( what a sad loss to family, friends and associates, > > > my condolences to all > > > > > > I met Bruce in the mid 1990's when he visited Otago university, > > > Dunedin, NZ > > > where I did my geology degree. Bruce did a couple of guest > speaker talks > > > ... one was on the response of the golden gate bridge to quakes > > > > > > It was so good to meet the man that really brought seismology > home to me > > > during the late ' 70's and ' 80's through his publications. > > > > > > thanks Bruce > > > > > > Dave Nelson > > > Sydney, Oz > > > > > > > > > __________________________________________________________ > > > > > > Public Seismic Network Mailing List (PSN-L) > > > > > > To leave this list email PSN-L-REQUEST@.............. with the body of > > > the message (first line only): unsubscribe > > > See http://www.seismicnet.com/maillist.html for more information. > > > > > > > --------------090006060605090302030801 > > Content-Type: text/html; charset=us-ascii > > Content-Transfer-Encoding: 7bit > > > > > > > > > > content="text/html;charset=ISO-8859-1"> > > > > > > > > Dear Psn BB readers
> > I'd appreciate any references to any obituary for Bruce Bolt.
> > I'd like to compose a small one to place in the newsletter for Aust > > earthquake Engineers Soc.
> >
> > Thanks all..
> > col lynam
> > volunteer observor, QUAKES group, ESSCC centre, Uni of Queensland, > > Australia
> >
> > Dave Nelson wrote:
> >> cite="mid5.1.0.14.1.20050722201958.01de7ce0@....................">At > > 02:50 AM 22/07/2005 -0700, you wrote: > >> > > > > > > > --------------090006060605090302030801-- > > > > > > > > > > __________________________________________________________ > > > > Public Seismic Network Mailing List (PSN-L) > > > > To leave this list email PSN-L-DIGEST-REQUEST@.............. with > > the body of the message (first line only): unsubscribe > > See http://www.seismicnet.com/maillist.html for more information. > > > > __________________________________________________________ > > Public Seismic Network Mailing List (PSN-L) > > To leave this list email PSN-L-REQUEST@.............. with > the body of the message (first line only): unsubscribe > See http://www.seismicnet.com/maillist.html for more information. > > __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
> >All, > >> >
> > I just read on a newsgroup that Bruce Bolt has passed away. I had the > > opportunity to meet him at a local conference a few years ago. > >
> > Regards, > >
> > Larry Cochrane > >
> > Redwood City, PSN > >
> >
> > ohhhh wow :( what a sad loss to > family, friends and associates, > >
> > my condolences to all > >
> >
> > I met Bruce in the mid 1990's when he visited Otago university, > > Dunedin, NZ > >
> > where I did my geology degree. Bruce did a couple of guest speaker > > talks > >
> > ... one was on the response of the golden gate bridge to quakes > >
> >
> > It was so good to meet the man that really brought seismology home to > > me > >
> > during the late ' 70's and ' 80's through his publications. > >
> >
> > thanks Bruce > >
> >
> > Dave Nelson > >
> > Sydney, Oz > >
> >
> >
> > __________________________________________________________ > >
> >
> > Public Seismic Network Mailing List (PSN-L) > >
> >
> > To leave this list email href="mailto:PSN-L-REQUEST@..............">PSN-L-REQUEST@SEISMICNE > T.COM > with the body of > > the message (first line only): unsubscribe > >
> > See href="http://www.seismicnet.com/maillist.html">http://www.seismicn > et.com/mai > llist.html for more information. > >
> >
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