Re: ATM 14.5 inch mirror stuck to pitch lap

["Philip J. Tramdack" <tramdack@TCNJ.EDU>]

If I remember correctly Amateur Telescope Making (3 v set issued in 30s
reissued three years ago by Wilmann Bell) has a number of articles about
unsticking glass stuck during grinding and polishing. The main thing is,
whatever you do, do it gradually. I for instance would not stick a
wooden doorstop wedge between the two and wack it with a mallet. Russell
Porter might have however. PJT

Hugues_Laroche@ses-astra.com wrote:
> 
> >Last night I stretched Saran plastic wrap over my pitch lap and placed
> >the mirror on top.  In no time it was stuck fast.  I can't budge it.
> 
> If there is a wrap layer, I think you will get it by a non-destructive
> way. Maybe drop ungripping oil (sorry don't know the exact wording)
> between the wrap and the _mirror_. You may have to wait several hours
> for it to find its way, which could be monitored through the glass
> if the back is polished or wet. Otherwise, or in addition,
> thermal variation should help.
> 
> Hugues

-- 
Philip J. Tramdack
Associate Dean for the Library
Roscoe L. West Library
The College of New Jersey
Box 7718
Ewing  NJ 08628-0718
vox 609-771-2343
fax 609-637-5177