Lectionary Calendar
Friday, July 18th, 2025
the Week of Proper 10 / Ordinary 15
the Week of Proper 10 / Ordinary 15
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Bible Encyclopedias
Heliograph
1911 Encyclopedia Britannica
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(from Gr. ijXtos, sun, and -ypa4Eav 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).
Copyright Statement
These files are public domain.
These files are public domain.
Bibliography Information
Chisholm, Hugh, General Editor. Entry for 'Heliograph'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/h/heliograph.html. 1910.
Chisholm, Hugh, General Editor. Entry for 'Heliograph'. 1911 Encyclopedia Britanica. https://www.studylight.org/encyclopedias/eng/bri/h/heliograph.html. 1910.
