Watkins factorial calculator

PART OF:
The Kodak Museum Collection
maker:
Alfred Watkins

Watkins Factorial calculator. Development calculator - two concentric discs bearing scales 1-50 (factors) 1 1/4-50secs. - time of appearance of image. Aluminium; [with joint instruction book for darkroom clock and calculator].

Details

Category:
Photographic Technology
Collection:
Kodak Collection
Object Number:
1990-5036/78
Materials:
aluminium (metal)
type:
factorial calculator
credit:
The Kodak Collection at the National Media Museum, Bradford