G - Physics – 01 – J
Patent
G - Physics
01
J
73/181
G01J 1/12 (2006.01) G01B 11/30 (2006.01)
Patent
CA 1110873
ABSTRACT OF THE DISCLOSURE A portable instrument quantitatively determining the distinctness of image of a sample paint film by providing comparison of the film with several standard films of known distinctness of image is provided. The instrument displays the sample and one of the standards within an enclosed casing while an image forming pattern is projected simultaneously on both by a light source within the instrument. By changing the standard which is displayed, an observer compares the distinctness of image of the sample with the known values of several standards until a match is found.
311933
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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