British photographic history

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Looks like a contact frame for doing a test strip either in 0.3 log progression i.e. 2,4 8 16 or possibly 0.15 log.

Will be interested in views form other ancient photographers who used these things back in the days when we  had darkrooms. 

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Comment by Michael Smallman on January 21, 2013 at 21:22
By its dimensions, I think it might accept a 6x9 negative i.e. one frame of 8 on a roll of 120 film
Comment by Alex Tymków MA ARPS on January 20, 2013 at 11:46

These were called Actinometers, as Jack says for making test strips. They were used for 'sun printing' or in the darkroom. 

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