Re: [APML]: Hypering thread ...

["Joseph O'Neil" <joneil@multiboard.com>]

Robert Reeves wrote:

> 
> I seriously doubt if it will cause any problem.  At McDonald Observatory
> before all the darkrooms became large closets with the arrival of CCDs, they
> hypered film plates in a constant flow of gas.  Hey, its only my Texas state
> tax money...they could afford it. <g>


        Actually, it is still doen that way in some places.  I was talking to David 
Levy a few months ago, he, Carolyn and the late Gene hypered tech pan by placing it in 
an oven and running forming gas over it during the hypering process.  They only did 
this for about 6-8 hours.  I do not know how good it works, but obviously good enough 
to discover comet Shoemaker-Levy, so they gotta be doing somethng right.  :)

        It does make me wonder if the constant flow of gas over the film carries away 
moisture and oxygen forced out of the film, and this in turn lessens the hypering 
times.
joe

joneil@obs.empath.on.ca
http://www.multiboard.com/~joneil
Astro-photo, infra-red, large format, B&W
and a single picture of my psychotic cat.