actinometer

Example Sentences

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With daylight, however, the light is constantly fluctuating, and this renders the use of an actinometer a necessity for correct exposure.

From Wireless Transmission of Photographs Second Edition, Revised and Enlarged 1919 by Martin, Marcus J.

A Johnson's actinometer is very useful to time the exposure.

From Photogravure by Blaney, Henry R.

A selenium actinometer has been described in the Comptes Rendus in a communication from M. Morize, of Rio de Janeiro.

From Scientific American Supplement, No. 484, April 11, 1885 by Various

The mystery was not a new type of infernal machine as they imagined but merely a home-made actinometer!

From Sixteen Months in Four German Prisons Wesel, Sennelager, Klingelputz, Ruhleben by Mahoney, Henry Charles

The actinometer of M. Violle is, in principle, a sphere of copper, blackened externally, and having inside a thermometric apparatus which registers some distance away.

From Sounding the Ocean of Air by Rotch, A. Lawrence