Online Encyclopedia

HELIOGRAPH (from Gr. riXLos, sun, and...

Online Encyclopedia
Originally appearing in Volume V13, Page 224 of the 1911 Encyclopedia Britannica.
Spread the word: it!
HELIOGRAPH (from Gr. riXLos, sun, and ypackly to write), an instrument for reflecting the rays of the sun (or the light obtained from any other source) over a considerable distance. Its main application is in military signalling (see SIGNAL). A similar instrument is the heliotrope, used principally for defining distant points in geodetic surveys, such as in the triangulation of India, and in the verification of the African arc of the meridian. It is necessary to distinguish the method of signalling termed heliography from the photographic process of the same name (see PHOTOGRAPHY). b
End of Article: HELIOGRAPH (from Gr. riXLos, sun, and ypackly to write)
HELIOMETER (from Gr. iXtos, sun, and p.Erpov, a mea...

Additional information and Comments

There are no comments yet for this article.
» Add information or comments to this article.
Please link directly to this article:
Highlight the code below, right click and select "copy." Paste it into a website, email, or other HTML document.