Watkins factorial calculator

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
Object Number:
1990-5036/78
type:
factorial calculator
taxonomy:
  • tools and equipment
  • equipment by process
  • image making equipment
  • photographic processing equipment
credit:
The Kodak Collection at the National Media Museum, Bradford
status:
Permanent collection

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