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photographic reading
photographic scale
photographic strip
Photographic telescope
Photographical
photographically
Photographing
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Photographometer
Photographone
photography
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Photoheliograph
photoinduced
photoinduction
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photoionization
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photojournalism
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photolithograph
Photolithographer

Photoheliometer definitions

Webster's 1913 Dictionary

Photoheliometer Pho`to*he`li*om"e*ter, n. [Photo- + heliometer.] (Astron.) A double-lens instrument for measuring slight variations of the sun's diameter by photography, utilizing the common chord of two overlapping images.




 


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