Re: [APML] Vacuum baking

["joe" <jmize@svic.net>]

George;

     Boggs Gasses in Titusville FL is quite knowledgable, the reason they
recomended the Hydrogen specific regulator is tolerances.  H2 is a smaller
than other gasses and escapes easier.  There wasn't too much a price
difference, maybe $15, from the regular Regulator.  I use a 22cu.ft aluminum
'scuba' type tank, it holds the pressure very well...joe :)


"May You Go Among The Imperishable Stars"

Joe Mize:     jmize@svic.net
StarFields Observatory   http://www.svic.net/jmize
Chiefland, FL    29:24'33.4"N    82:51'37.7"W
Moon Phase:     http://tycho.usno.navy.mil/cgi-bin/phase.gif

----- Original Message ----- 
From: "George Anderson" <georgea@cam.org>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Tuesday, July 06, 2004 11:45 PM
Subject: Re: [APML] Vacuum baking


> Thanks Joe
>
> I watch what the gas vendor says when I talk to him tomorrow (if all
> goes well) and see what kind of warnings I am given.
> The volatility of forming gas is a lot less than with acetylene or even
> propane, but because the gas contains hydrogen everyone tends to get
> twitchy and think of the Hindenberg.
>
> George Anderson
> Montreal Canada
>
> Clear skies and good health
>
> joe wrote:
> >
> > George;
> >
> >      "I have a pressure regulator already..."  down here in Florida I
was
> > recomended to use a Hydrogen specific regulator...joe  :)
> >
> > "May You Go Among The Imperishable Stars"
> >
> > Joe Mize:     jmize@svic.net
> > StarFields Observatory   http://www.svic.net/jmize
> > Chiefland, FL    29:24'33.4"N    82:51'37.7"W
> > Moon Phase:     http://tycho.usno.navy.mil/cgi-bin/phase.gif
> >
> > ----- Original Message -----
> > From: "George Anderson" <georgea@cam.org>
> > To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
> > Sent: Monday, July 05, 2004 11:46 PM
> > Subject: Re: [APML] Vacuum baking
> >
> > > Hi Kent
> > >
> > > If I can buy the tank I will do so. However many of the gas companies
up
> > > here do not want to refill other peoples tanks, they claim a safety
> > > issue.
> > > I have a pressure regulator already so it is just a case of getting
the
> > > tank of gas and then plumbing everything together.
> > > Needless to say I am itching and twitching.
> > > Between Robert Reeves book and John Mirtle's article on "The Poor
Man's
> > > Schmidt" I am very eager to try techpan and HA as well as start
building
> > > my 6" f/2 schmidt. The mirror is waiting final figuring after I grind
> > > and polish the corrector, and the vacuum pan for grinding the
corrector
> > > was made today.
> > >
> > > George Anderson
> > > Montreal Canada
> > >
> > > Clear skies and good health
> > >
> > > KGKIRKLEY@aol.com wrote:
> > > >
> > > > George:
> > > > Why not buy the cylinder and pressure regulator?
> > > > A 40 cu. ft. tank and pressure regulator is only around $ 100 US.
> > > > You could even get a 20 cu. ft. tank which would be less.
> > > > It won't take many months of rental and you could own it.
> > > > In addition, a 20 or 40 cu. ft. tank of forming gas will last a long
> > > > long time.
> > > > I've had a 40 cu. ft. tank since 1999 and have done aomething like
60
> > > > hypering runs and still have over half the tank left.
> > > >
> > > > Kent Kirkley
> > > >
> > > >     ---------------------------------------------------------------
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