Rob
re # 436 The only thing I have seen that comes close is a tester for
finding out the hardness of optical pitch used to polish telescope
mirrors and lenses. Although they are usually calibrated with a scale
of some kind. Maybe it had a similar use for a different item. See the
url below

http://www.turbofast.com.au/astrotel/pitchtester.html

R.H. wrote:
A new set of photos has been posted:

http://puzzlephotos.blogspot.com/


Rob