Word:

Photoheliometer

Pho`to`he`li`om´e`ter
n.1.(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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photographic emulsion
photographic equipment
photographic film
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photographic plate
photographic print
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Photoheliograph
-- Photoheliometer --
photojournalism
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Photolithograph
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Photometer
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