actinometer

[ ak-tuh-nom-i-ter ]

noun

1. a device for measuring intensity of radiation, especially that of the sun.

actinometer

/ ˌæktɪnəʊˈmɛtrɪk; ˌæktɪˈnɒmɪtə /

noun

1. an instrument for measuring the intensity of radiation, esp of the sun's rays

actinometer

/ ăk′tə-nŏm′ĭ-tər /

1. Any of several instruments used to measure radiation, such as a pyrheliometer.

Derived Forms

• ˌactiˈnometry, noun
• actinometric, adjective

Other Words From

• ac·tin·o·met·ric [ak-tin-oh-, me, -trik, ak-t, uh, -noh-], ac·tino·metri·cal adjective
• acti·nome·try noun

Word History and Origins

Origin of actinometer¹

First recorded in 1825–35; actino- + -meter

Example Sentences

A very suitable instrument for timing the exposure of carbon tissue is Sawyer's actinometer.

From Project Gutenberg

The actinometer consists of a large cylindrical thermometer bulb, with a scale considerably lengthened, so that minute changes may be easily seen.

From Project Gutenberg

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 Project Gutenberg

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

From Project Gutenberg

Another object was, to bring down specimens of air from different altitudes, for analysis; to try the effect of the actinometer at great elevations; and to note the hygrometric condition.

From Project Gutenberg