See also:

• HELIOGRAPH (from Gr. riXLos, sun, and ypackly to write)

HELIOGRAPH (from Gr. riXLos, See also:

• SUN
• SUN (0. Eng. sonne, Ger. sonne. Fr. soleil, Lat. sol, Gr. ijXior, from which comes helio- in various English compounds)

sun, and ypackly to write)  , an See also:

• INSTRUMENT (Lat. instrumentum, from insincere, to build up, furnish, arrange, prepare)

instrument for reflecting the rays of the See also:

• SUN
• SUN (0. Eng. sonne, Ger. sonne. Fr. soleil, Lat. sol, Gr. ijXior, from which comes helio- in various English compounds)

sun (or the See also:

• LIGHT

light obtained from any other source) over a considerable distance . Its See also:

• MAIN (from the Aryan root which appears in " may " and " might," and Lat. magnus, great)
• MAIN (Lat. Moenus)

main application is in military signalling (see See also:

• SIGNAL

SIGNAL) . A similar instrument is the See also:

• HELIOTROPE
• HELIOTROPE, or TURNSOLE

heliotrope, used principally for defining distant points in See also:

• GEODETIC

geodetic surveys, such as in the triangulation of See also:

• INDIA
• INDIA, FRENCH

India, and in the verification of the See also:

• AFRICAN

African arc of the See also:

• MERIDIAN
• MERIDIAN (from the Lat. meridianus, pertaining to the south or mid-day)

meridian . It is necessary to distinguish the method of signalling termed heliography from the photographic See also:

• PROCESS

process of the same name (see See also:

• PHOTOGRAPHY (Gr. bias, light, and ypa w, to write)
• PHOTOGRAPHY, CELESTIAL

PHOTOGRAPHY) .