Originally Posted by
shobley
Can you give me a link to the kind of glass I should be using to seal off the exit hole?
Probably the cheapest and most convenient way is a Camera UV filter. They come in various diameters, just be careful to check the specs to make sure they transmit all light above ~400nm. Also, make sure that you get a clear multi antireflection coated one, some of them have slight tints on them which is something you definately don't want.
Cheers
Jem
Quote: "There is a theory which states that if ever, for any reason, anyone discovers what exactly the Universe is for and why it is here it will instantly disappear and be replaced by something even more bizarre and inexplicable. There is another that states that this has already happened.”... Douglas Adams 1952 - 2001