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Slide-rule type calculator made in celluloid for motion picture use This piece offers a tangible connection to the history of photography and provides a glimpse into the methods used by photographers before the conveniences of modern technology. The overall condition of this Harvey Exposure Meter speaks to its likely practical use in the early 20th century. The dense information, presented in charts and tables, is characteristic of technical manuals of the period. Vest pocket size Measures approx.: 6" x 2" Directions for use included on the back side Copyright 1915, By G. L. Harvey 105 S. Dearborn Street, Chicago
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