MUSEUM QUALITY Very Rare 1922~HARROLD EXPOSURE SCALE~Photography~Cellulose~

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MUSEUM QUALITY Very Rare 1922~HARROLD EXPOSURE SCALE~Photography~Cellulose~:
$74.99

Measures 2 3/4\" x 3 15/16\" and is mostly made of Cellulose Nitrate C6H7(NO2)3O5 Has three colored dials that turn to fit different parameters; these would help a photographer know how to set his camera for light. ONE OF THESE IS IN THE SMITHSONIAN MUSEUM OF AMERICAN HISTORY WASHINGTON DC...MUSEUM QUALITY Very Rare 1922~HARROLD EXPOSURE SCALE~Photography~Cellulose~

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