What does "light mill" mean?

An airtight glass bulb containing a partial vacuum and a set of vanes, mounted on a spindle, which rotate when exposed to light, providing a quantitative measurement of electromagnetic radiation intensity.

What is a synonym for "light mill"?

Common synonyms include: radiometer.

Light mill

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
An airtight glass bulb containing a partial vacuum and a set of vanes, mounted on a spindle, which rotate when exposed to light, providing a quantitative measurement of electromagnetic radiation intensity.

Synonyms

All synonyms

radiometer

Etymology

By analogy with windmill and water mill.

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