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

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

End of Article: HELIOGRAPH (from Gr. riXLos, sun, and ypackly to write)
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HELIOMETER (from Gr. iXtos, sun, and p.Erpov, a mea...

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