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photometer

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photometer

Instrument that measures the intensity of light (electromagnetic radiation in the visible range), usually by comparing relative intensities from different sources. Bunsen's grease-spot photometer of 1844 compares the intensity of a light source with that of a known source by using each source to illuminate one half of a translucent area. Modern photometers use photocells, as in a photographer's exposure meter. A photomultiplier can also be used as a photometer.



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We are the photometers, we the irritable goldleaf and tinfoil that measure the accumulations of the subtle element.
Essays, First Series by Emerson, Ralph Waldo View in context
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