Heliograph

[hi:liәgræf]

Definition

(noun.) an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on.

(verb.) signal by means of a mirror and the using the sun's rays.

Edited by Christine--From WordNet

Definition

(n.) A picture taken by heliography; a photograph.

(n.) An instrument for taking photographs of the sun.

(n.) An apparatus for telegraphing by means of the sun's rays. See Heliotrope, 3.

Typed by Laverne

Definition

n. an apparatus for signalling by means of the sun's rays: an engraving obtained by a process in which a specially prepared plate is acted on chemically by exposure to light: an apparatus for taking photographs of the sun.—v.t. to signal to by means of the sun's rays.—n. Heliog′rapher.—adjs. Heliograph′ic -al.—adv. Heliograph′ically.—ns. Heliog′raphy a method of communicating swiftly between distant points by means of the sun's rays reflected from mirrors: photography; Heliogrā′vure (or hā-li-ō-gra-vé»?prime;) photo-engraving or a print obtained by this process.

Edited by Allison