Method and device for measuring a degree of exhaustion of photog

Details Method and device for measuring a degree of exhaustion of photog Method and device for measuring a degree of exhaustion of photog

1981-03-03

1983-02-22

Yasich, Daniel M.

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Calculators

Photographic

116321, 235 89R, 356404, G06C 300, G03C 100

Patent

active

043750311

ABSTRACT:
An exhaustion degree measuring board for measuring the fatigue of photographic processing solutions including a base member having at least one reference density window formed therein along with graduated scales corresponding to a control strip. The reference density windows have upper and lower portions with the upper portion being transparent for viewing the relevant part of the control strip and the lower part of at least one of the windows having a varying dot density. A center line with a reference mark is formed on the base for alignment with the control strip.

REFERENCES:
patent: 1566046 (1925-12-01), Sleight
patent: 2240053 (1941-04-01), Richardson
patent: 2286780 (1942-06-01), Yule
patent: 2370683 (1945-03-01), Palma
patent: 2380244 (1945-07-01), Jones et al.
patent: 3685726 (1972-08-01), Wada et al.
patent: 3685900 (1972-08-01), Kirby et al.
patent: 4059357 (1977-11-01), Klein
patent: 4259423 (1981-03-01), Merlo

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