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LOT 0039
A Hurter & Driffield's Actinograph Exposure Calculator
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A Hurter & Driffield's Actinograph Exposure Calculator with cylindrical mean light Calendar meter, sliding speed and exposure scale, and Table of Factors, 1888 Patent, in maker's fitted wooden case with instructions, and maker's cardboard box, in fine condition
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Time, Location
06 Oct 2021
UK, London
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[ translate ]
A Hurter & Driffield's Actinograph Exposure Calculator with cylindrical mean light Calendar meter, sliding speed and exposure scale, and Table of Factors, 1888 Patent, in maker's fitted wooden case with instructions, and maker's cardboard box, in fine condition
