photoheliograph


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photoheliograph

[¦fōd·ō′hē·lē·ə‚graf]
(optics)
A refracting telescope specially designed to photograph the sun's disk.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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In 1929 the photoheliograph was removed and placed on a mount in the NW dome, where it sill is.
Heliographical positions and areas of sun-spots observed with the Kew photoheliograph during the years 1862 and 1863.
So impressed was the Royal Astronomical Society that it enlisted De la Rue in the construction of a specialized telescopic camera (a "photoheliograph") to monitor sunspots and photograph eclipses.
A partial eclipse of the Sun on April 17 photographed from Greenwich with the Thompson Photoheliograph when 15 exposures were made.