a device for measuring minute amounts of radiant energy by determining the changes of resistance in an electric conductor caused by changes in its temperature.
Historical Examples

Astronomy of To-day Cecil G. Dolmage
The Nature of Animal Light E. Newton Harvey
The Nature of Animal Light E. Newton Harvey
The Outline of Science, Vol. 1 (of 4) J. Arthur Thomson

a sensitive instrument for measuring radiant energy by the increase in the resistance of an electrical conductor


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