actinometer
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
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
When you get home, the first thing to do is to get hold of a paint box and paint the underside of the glass of your actinometer to match the darkened paper.
From Scientific American Supplement, No. 492, June 6, 1885 by Various
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.
The actinometer indicated an exposure of thirty seconds where in good light one would be right.
From Scientific American Supplement, No. 492, June 6, 1885 by Various
A Johnson's actinometer is very useful to time the exposure.
From Photogravure by Blaney, Henry R.
