I recall a few years ago some-one was looking for a glass dome to put over an all sky camera, i.e. one that monitor's the sky conditions.
Well I saw at Astrofest that W&W dew heaters were selling them.
Probably far too late now, for the original poster, but thought I'd impart that information in case it was of use to any-one.
Carole
Just bought a dummy CCTV camera dome complete for £3.69 delivered! I have a 5 year old project to complete!
Know the feeling well Duncan ! What happened to the last dome - did it have too much distortion ?
Carole, I believe that was a prototype.
Got scratched. And I didn't put enough effort into mounting the camera securely.