Heliostat
Hawkins' Electrical Dictionary · 1915 · p. 3
—An instrument consisting of a mirror kept in motion by clockwork in such a way as to constantly reflect the rays of the sun in a fixed direction.
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Adair's New Encyclopedia (1923)
Héliostat
—
French-English Dictionary of Military Terms (1918)
Everybody's Encyelopedia (1912)
The American Dictionary and Cyclopedia (1910)
Chamber's Twientieth Century Dictionary (1908)
The Optical Dictionary (1904)
Chandler's Encyclopedia (1898)
An Illustrated Encyclopedic Medical Dictionary (1893)
Zell's Condensed Dictionary (1879)
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