When we survey in the north in winter (Ontario)the data
collectors often freeze up.We made a styrofoam half
box and cut out a spot for a 'chemical heater'(lit charcol
inside a tin box,sold at any Canadian Tire store)and this
kept the intsrument warmer.May not have any practical
photography use,just thought i'd share.
Dave
---- Begin Original Message ----
From: Jostein Oksne <[EMAIL PROTECTED]>
Sent: Tue, 14 Aug 2001 08:32:56 +0200
To: "'[EMAIL PROTECTED]'" <[EMAIL PROTECTED]>
Subject: OT: Chemical pocket heaters (was RE: Aurora Borealis
shooting)
I think you're right Doug.
Inside there's a chemical mixture that reacts when exposed to air or
moisture. To keep camera gear warm, be sure to get the "exposed to
air"
variant.
Though i guess all chemical reactions like that will go pretty slow
at deep
freezer temperatures.
Jostein
> -----Original Message-----
> From: Doug Franklin [mailto:[EMAIL PROTECTED]]
> Could he be talking about those little "keep warm" packets
> that you can
> get at camping stores? �You know, the little bags that you squeeze
to
> break a container inside, then it generates heat for a couple of
hours
> ... sort of like a Cyalume stick for heat instead of light.
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