heliograph
[hee-lee-uh-graf, -grahf]
noun
a device for signaling by means of a movable mirror that reflects beams of light, especially sunlight, to a distance.
Astronomy. photoheliograph.
Meteorology. an instrument for recording the duration and intensity of sunshine.
Photography, Printing. an early type of photoengraving made on a metal plate coated with sensitized asphalt.
verb (used with or without object)
to communicate by heliograph.
Origin of heliograph
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for heliograph
flare, lantern, radar, rocket, alarm, sign, beam, lamp, watchtower, alert, bonfire, lighthouse, pharos, lodestar, balefire, guidepostExamples from the Web for heliograph
Historical Examples of heliograph
Instantly, the ship shone like the polished mirror of a heliograph.
Islands of SpaceJohn W Campbell
He had also been corroborated by a man who had seen the man who took it down from the heliograph.
A Yeoman's LettersP. T. Ross
The heliograph would be useless in stormy weather or in fog.
El DiabloBrayton Norton
The Hussars left behind a Colt-Maxim and a heliograph for our usage.
My Reminiscences of the Anglo-Boer WarBen Viljoen.
If there is no sun I cannot heliograph and I have a host of signals to look up and get ready.
The Pillar of LightLouis Tracy
heliograph
noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper