Re: [ATM] Re: ATM zones

[Dale Eason <atmpob@yahoo.com>]

Yes,
What I did was to have a large bucket of water that
had been sitting on the basement floor for a couple of
days.  I put the mirror in it for 20 to 30 minutes
usually until my non contact IR thermometer measured
the mirror and room as the same.  But since I have the
robo test I just started it testing, went to bed and
then looked at the results in the morning.  Since it
seemed like it always took awhile to stabilize, I just
stopped the extra effort that the water took and
waited till the next evening.  I was very close to the
final figure when doing this so one figuring session
per day was ok with me.

There is still the chance that the mirror has internal
stress that is the cause.  All I know is that the
figure didn't settle until several hours.

Dale Eason
--- Guy Brandenburg <gfbrandenburg@yahoo.com> wrote:

> Dale,
> Your data is (are) important!
> Have you tried immersing the plate glass mirror in a
> room-temperature water bath to stabilize the
> temperature?
> Guy B
> 
> --- Dale Eason <atmpob@yahoo.com> wrote:
> 
> > Bob,
> > 
> > You didn't say if your mirror is pyrex or plate or
> > etc.  That makes a huge difference.  My 16 X 1
> inch
> > plate takes all night to reach equilibrium.  I
> have
> > tried blowing on it with a big fan but because the
> > basement floor in winter is 5 to 10 deg colder
> than
> > the air one foot above it and because the mirror
> > stand
> > is on the floor tilted back at 20 deg the mirror
> > gets
> > colder than room temp and that too causes
> problems. 
> > I
> > have a measured its temp and it is only about 1
> deg
> > diff from room.  Then the next day when it is the
> > same
> > temp the figure is different.  It does not change
> > after that.  In fact with my automated Robo tester
> I
> > can set it to take measurments all night.  The
> > results
> > are that the figure changes for about 5 hours.  I
> > measured using polarizers for strain and I did not
> > have any so I think it is the temp change.
> > 
> > It all depends on your situation.
> > 
> > Dale Eason
> > 
> 
> =====
> Guy  Brandenburg
> Washington, DC
> My home page:
>
http://home.earthlink.net/~gfbranden/GFB_Home_Page.html
> 


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