The heliograph was standard issue for the British and Australian armies until the 1960s.
I'm looking for a new mirror for my heliograph.
There were many heliograph types.
The heliograph had many great advantages.
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The captain of the ship used the heliographic light to signal the people in the sailboat.
The cast of Trapped by a Heliograph - 1914 includes: Jessie Gill as Laura Lucas
The heliograph was invented in the 1860s by French scientist and engineer, Alphonse Berget. It was used as a form of long-distance communication by reflecting sunlight with a mirror to send messages by Morse code.
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It measures he amount of sunlight at a given location.
The Heliograph was invented by French physicist and inventor Claude Chappe in the late 18th century. It used a system of moving arms and pivots to relay messages over long distances by reflecting sunlight. The Heliograph was used as a form of optical telegraphy before the invention of the electric telegraph.
Guide, beam, flare, signal, sign, watchtower, alarm, alert, heliograph, lantern...
The heliograph was invented by the French engineer and scientist, Claude Chappe, in the late 18th century. He developed a visual signaling system using a series of movable arms and shutters that could convey messages over long distances using sunlight.
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A heliograph uses a mirror to reflect sunlight to a distant observer. By moving the mirror, flashes of light can be used to send Morse code. The heliograph was a simple but highly effective instrument for instantaneous optical communication over 80km or more in the 19th century.
A heliograph is a device for sending messages or signaling by flashing the sun's rays from a mirror.