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

For judging long exposures, the use of an actinometer (issued in many inexpensive forms) is helpful.

From Project Gutenberg

We then shift the paper in the actinometer so as to get a fresh portion under the tissue strips, or we substitute a new piece.

From Project Gutenberg

Now refer to the actinometer and see what has taken place on the silver paper which we put into it.

From Project Gutenberg

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

From Project Gutenberg

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

From Project Gutenberg