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
>
> 
> 
> 
> 
>  Arial"=20
> bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7> 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? 
> 
 
> 
 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.
>
> _________________________________________________________________
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> __________________________________________________________
>
> 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
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>
>
>
> MariamKMarshall
>
>
> __________________________________________________
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> --0-297853181-1122081529=:48544
> Content-Type: text/html; charset=iso-8859-1
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>
> 

> 
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
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>
information.

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PSN-L-REQUEST@.............. with 
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> 
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___
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of spam?  Yahoo! Mail has the best spam protection around

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> --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
>
> 
> 
> 
>   
>   
> 
> 
> 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:
>   

>   
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/mai
llist.html for more information.
>   

>   

> 
> 
> 
>
> --------------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
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