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----- Original Message -----
From: JAMES ALLEN 
Date: Tuesday, August 26, 2008 9:27 pm
Subject: Re: SPRENGNETHER 201 LONG PERIOD VERTICAL SEISMOMETER
To: psn-l@..............

> Thanks Meredith.  Can't wait to get the metal for the 
> seismometer.  Will let you know how it turns out.  
> BTW, no need to eat crow.  You, Chris and Dick have been 
> invaluable to be.
> James Allen
>   ----- Original Message ----- 
>   From: meredith lamb 
>   To: psn-l@.............. 
>   Sent: Monday, August 25, 2008 6:38 PM
>   Subject: Re: SPRENGNETHER 201 LONG PERIOD VERTICAL SEISMOMETER
> 
> 
>   James,
> 
>   Its time for me to eat some crow...and happily learn 
> more.   Chris Chapman forwarded me a email on this 
> subject and informs "us" that the door strip is ordinary bronze 
> (not phosphor bronze) and about 0.006" thick.
> 
>   Chris Chapman quotes:
> 
>   "As long as the strip can bear the load without exceeding 
> its elastic limit, that will be fine.  A 1/4" strip, 13 
> thou thick at 10 lbs is about 3,000 psi.  Even cast 
> material will give you >25,000 psi yield strength.  Any 
> difference in the springyness will be taken up when the
>   horizontal balance is set.  We have used SS safety 
> razor blades as spring suspensions in verticals quite OK."
> 
>   "However, I note that McMaster do supply the 510 alloy in 
> small sheets for about $20.  This is the very high strength 
> springy phosphor bronze 98,000 to 154,000 psi yield, but it is 
> difficult to machine.  You could probably coat it with 
> candle wax, use a scriber to make lines and then etch the shape 
> with acid. Maybe vinegar? I haven't tried it, but it will likely 
> work.  Metal acetates are mostly soluable.  
> Alternatively, you electolytically etch the line?"
> 
>   "KS metals also supply 10 and 18 thou thick 430 SS 1/2" 
> strip.  KS metals supply 8 thou PB sheet."
> 
>   The sentences in bold letters abover are the real 
> clinchers.  I'll forward the 0.014" thick phosphor bronze 
> by mail.  It can be easily be
>   cut up with hand shears and rough edges deburred with a file.
> 
> 
>   Take care, Meredith
> 
> 
>   On Sun, Aug 24, 2008 at 10:59 PM, JAMES ALLEN 
>  wrote:
> 
>     Thanks Meredith, I will check.  Perhaps 
> some old fashioned hardware stores or scrap metal dealers.  
> If I find some I will make it available to all who wants 
> some.  Again, thanks for all your help and advice.
>     James Allen
> 
=3CDIV=3EPlease unsubsribe this email address from your list=2E=3C/DIV=3E=

=3CDIV=3E=26nbsp=3B=3C/DIV=3E
=3CDIV=3EThank you=3C/DIV=3E
=3CDIV=3EMerci=3CBR=3E=3CBR=3E----- Original Message -----=3CBR=3EFrom=3A=
 JAMES ALLEN =26lt=3Bjcallen1=40verizon=2Enet=26gt=3B=3CBR=3EDate=3A Tue=
sday=2C August 26=2C 2008 9=3A27 pm=3CBR=3ESubject=3A Re=3A SPRENGNETHER=
 201 LONG PERIOD VERTICAL SEISMOMETER=3CBR=3ETo=3A psn-l=40webtronics=2E=
com=3CBR=3E=3CBR=3E=26gt=3B Thanks Meredith=2E=26nbsp=3B Can=27t wait to=
 get the metal for the =3CBR=3E=26gt=3B seismometer=2E=26nbsp=3B Will le=
t you know how it turns out=2E=26nbsp=3B =3CBR=3E=26gt=3B BTW=2C no need=
 to eat crow=2E=26nbsp=3B You=2C Chris and Dick have been =3CBR=3E=26gt=3B=
 invaluable to be=2E=3CBR=3E=26gt=3B James Allen=3CBR=3E=26gt=3B =26nbsp=
=3B ----- Original Message ----- =3CBR=3E=26gt=3B =26nbsp=3B From=3A mer=
edith lamb =3CBR=3E=26gt=3B =26nbsp=3B To=3A psn-l=40webtronics=2Ecom =3C=
BR=3E=26gt=3B =26nbsp=3B Sent=3A Monday=2C August 25=2C 2008 6=3A38 PM=3C=
BR=3E=26gt=3B =26nbsp=3B Subject=3A Re=3A SPRENGNETHER 201 LONG PERIOD V=
ERTICAL SEISMOMETER=3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =26=
nbsp=3B James=2C=3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =26nbsp=3B Its time fo=
r me to eat some crow=2E=2E=2Eand happily learn =3CBR=3E=26gt=3B more=2E=
=26nbsp=3B=26nbsp=3B Chris Chapman forwarded me a email on this =3CBR=3E=
=26gt=3B subject and informs =22us=22 that the door strip is ordinary br=
onze =3CBR=3E=26gt=3B (not phosphor bronze) and about 0=2E006=22 thick=2E=
=3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =26nbsp=3B Chris Chapman quotes=3A=3CB=
R=3E=26gt=3B =3CBR=3E=26gt=3B =26nbsp=3B =22As long as the strip can bea=
r the load without exceeding =3CBR=3E=26gt=3B its elastic limit=2C that =
will be fine=2E=26nbsp=3B A 1/4=22 strip=2C 13 =3CBR=3E=26gt=3B thou thi=
ck at 10 lbs is about 3=2C000 psi=2E=26nbsp=3B Even cast =3CBR=3E=26gt=3B=
 material will give you =26gt=3B25=2C000 psi yield strength=2E=26nbsp=3B=
 Any =3CBR=3E=26gt=3B difference in the springyness will be taken up whe=
n the=3CBR=3E=26gt=3B =26nbsp=3B horizontal balance is set=2E=26nbsp=3B =
We have used SS safety =3CBR=3E=26gt=3B razor blades as spring suspensio=
ns in verticals quite OK=2E=22=3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =26nbsp=3B=
 =22However=2C I note that McMaster do supply the 510 alloy in =3CBR=3E=26=
gt=3B small sheets for about =2420=2E=26nbsp=3B This is the very high st=
rength =3CBR=3E=26gt=3B springy phosphor bronze 98=2C000 to 154=2C000 ps=
i yield=2C but it is =3CBR=3E=26gt=3B difficult to machine=2E=26nbsp=3B =
You could probably coat it with =3CBR=3E=26gt=3B candle wax=2C use a scr=
iber to make lines and then etch the shape =3CBR=3E=26gt=3B with acid=2E=
 Maybe vinegar=3F I haven=27t tried it=2C but it will likely =3CBR=3E=26=
gt=3B work=2E=26nbsp=3B Metal acetates are mostly soluable=2E=26nbsp=3B =
=3CBR=3E=26gt=3B Alternatively=2C you electolytically etch the line=3F=22=
=3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =26nbsp=3B =22KS metals also supply 10=
 and 18 thou thick 430 SS 1/2=22 =3CBR=3E=26gt=3B strip=2E=26nbsp=3B KS =
metals supply 8 thou PB sheet=2E=22=3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =26=
nbsp=3B The sentences in bold letters abover are the real =3CBR=3E=26gt=3B=
 clinchers=2E=26nbsp=3B I=27ll forward the 0=2E014=22 thick phosphor bro=
nze =3CBR=3E=26gt=3B by mail=2E=26nbsp=3B It can be easily be=3CBR=3E=26=
gt=3B =26nbsp=3B cut up with hand shears and rough edges deburred with a=
 file=2E=3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =26nbsp=3B Ta=
ke care=2C Meredith=3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =3CBR=3E=26gt=3B =26=
nbsp=3B On Sun=2C Aug 24=2C 2008 at 10=3A59 PM=2C JAMES ALLEN =3CBR=3E=26=
gt=3B =26lt=3Bjcallen1=40verizon=2Enet=26gt=3B wrote=3A=3CBR=3E=26gt=3B =
=3CBR=3E=26gt=3B =26nbsp=3B=26nbsp=3B=26nbsp=3B Thanks Meredith=2C I wil=
l check=2E=26nbsp=3B Perhaps =3CBR=3E=26gt=3B some old fashioned hardwar=
e stores or scrap metal dealers=2E=26nbsp=3B =3CBR=3E=26gt=3B If I find =
some I will make it available to all who wants =3CBR=3E=26gt=3B some=2E=26=
nbsp=3B Again=2C thanks for all your help and advice=2E=3CBR=3E=26gt=3B =
=26nbsp=3B=26nbsp=3B=26nbsp=3B James Allen=3CBR=3E=26gt=3B =3C/DIV=3E