The following message was received by the list coordinator. If you can provide some guidance to the person who sent his message you may do so by sending him mail directly although it would be nice if you'd also post the reply to this list. Thank you, ____________________________________________ andrew davidhazy Date: Thu, 20 May 1999 11:32:27 -0700 From: [EMAIL PROTECTED] I am working on setting up a schlieren system to visualize a supersonic jet exiting into a 2 torr vacuum atmosphere. Since my application involves a 2 torr vacuum exit condition, I am planning on creating a small vacuum chamber and placing it in the test area of the schlieren system. Do you have any suggestions regarding the quality of the glass for the viewports where the light will pass through? Do you know where I can get such glass? Thanks, Gerson Goldberg
