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