[Space] condensation on lenses

[Bryan Klofas]

Hey Everybody--

A while back I built a small bell-jar thermal vacuum chamber at work. 
The thermal plate goes down to -50 degC, and pressure down to 0.2 torr 
(about 60km/200k ft). It's in use this week, but next week I think it's 
free. I could try some different "heated window" designs if you want me to.

Thanks.
--
Bryan Klofas, KF6ZEO

On 06/09/2010 10:20 AM, Jonathan Moore wrote:
> On Wed, Jun 9, 2010 at 10:08 AM, Blake Barrett<Blake at blakebarrett.net>  wrote:
>>
>>     The thought of using a hand warmer has arisen before, but all the ones we
>> have come across are either electric (and thus requires batteries) or are
>> chemical based that require oxygen to create their heat.
>
> Backus uses the air breathing hand warmers and it has worked out well for them.
>
> -Jonathan