Step tablet

Details Step tablet Step tablet

1983-12-01

1986-05-13

Willis, Davis L.

Optics: measuring and testing

For light transmission or absorption

Of photographic film

283 37, 354 20, 356243, G01N 2100

Patent

active

045882983

ABSTRACT:
A step tablet with which an amount of exposure or degree of exhaustion of a developing solution can very readily been determined. The step chart is composed of a number of rectangular patches of photosensitive material, arranged in an order of sensitivity. The steps are each marked with two indicia, one having an optical density corresponding, upon development, of a step of minimum optical density, while the other corresponds to a step of maximum optical density.

REFERENCES:
patent: 2226167 (1940-12-01), Gillon
patent: 2253231 (1941-08-01), Friedell
patent: 2322044 (1943-06-01), McFarlane et al.
patent: 2380244 (1945-07-01), Jones et al.
patent: 4047817 (1977-09-01), Enomoto
patent: 4183990 (1980-01-01), Uchida et al.
patent: 4492474 (1985-01-01), Miller

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