from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A telescope equipped to photograph the sun.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A heliograph, with a camera attached, used to photograph the Sun
from the GNU version of the Collaborative International Dictionary of English
- n. A modified kind of telescope adapted to taking photographs of the sun.
from The Century Dictionary and Cyclopedia
- n. A photographic telescope designed for making photo-graphs of the sun, particularly at a transit of Venus or at a solar eclipse. There are several forms of the instrument, differing widely in construction.
Sorry, no etymologies found.
The resulting "photoheliograph" may be described as
With the telescope, micrometer, heliostat, and spectroscope came desire for more complex instruments, resulting in the invention of the photoheliograph, invoking the aid of photography to make permanent the results of these exciting researches.
A four-inch equatorial stands on a half round bastion, at the west end of the bridge, and a photoheliograph at the east end of the old wall, over the barracks of the gendarmes.
Photographs of the sun have been taken with the photoheliograph on 182 days.
Huggins studied the chemistry of the stars by means of the spectroscope, and when Warren De la Rue set up a photoheliograph at
But astronomical photography really owes its beginning to De la Rue, who used the collodion process for the moon in 1853, and constructed the Kew photoheliograph in 1857, from which date these instruments have been multiplied, and have given us an accurate record of the sun's surface.
It was one of the heaviest of the lot, containing the cast-iron pier on which the photoheliograph was to be mounted.