Heyde's Aktino-photometer

Disc-cylindrical extinction meter (see 535 - smaller) rotating continuous wedge behind blue glass in eyepieces. 1 scale.

Details

Category:
Photographic Technology
Collection:
Kodak Collection
Object Number:
1990-5036/536
Materials:
glass
type:
extinction calculator
credit:
The Kodak Collection at the National Media Museum, Bradford