ATM A source of ronchi gratings

["Tom Krajci" <krajcit@det5wg57.barksdale.af.mil>]

While in our sysadmin's office I was looking at a dismantled hard 
drive unit from a PC.  There's a ruled grating on glass in some of 
those things.  (Used to give positional feedback for what track the 
heads have been moved to.)

If you've got a broken hard drive unit lying about you might find a 
small ronchi grating. . .but be careful, the glass is epoxied to a 
metal frame.  It'll be tricky getting it off without shattering it.  
It might be wiser to cut the frame (usually aluminum) and not try to 
break the epoxy/glass bond.

Hope this helps you ronchi testers out there.

Tom Krajci

Capt Tom Krajci
B-52 Intelligence Officer
"There are two things people should not see being made:
1.  Sausage.
2.  Intelligence Assessments."
http://spur.barksdale.af.mil