actinometer

American  

[ak-tuh-nom-i-ter] / ˌæk təˈnɒm ɪ tər /

noun

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

---

actinometer British  

/ ˌæktɪˈnɒmɪtə /

noun

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

---

actinometer Scientific  

/ ăk′tə-nŏm′ĭ-tər /

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

---

Other Word Forms

• actinometry
  noun
• actinometric
  adjective
• actinometrical
  adjective

---

Etymology

Origin of actinometer

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

---

Example Sentences

See Examples For:

actinometer

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

From Photogravure by Henry R. Blaney

Then note down everything you have done—kind of view, stop, speed of plate, exposure of each plate, and length of exposure of actinometer.

From Scientific American Supplement, No. 492, June 6, 1885 by Various

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 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

You may sometimes find that the actinometer indicates a very different exposure from what the eye would lead you to expect.

From Scientific American Supplement, No. 492, June 6, 1885 by Various

Random Word

Spin the wheel and learn a new word!

---