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.
look! i just made a heliograph!
The captain of the ship used the heliographic light to signal the people in the sailboat.
The heliograph was used by the ancient egyptians as early as 500 C.E.
The cast of Trapped by a Heliograph - 1914 includes: Jessie Gill as Laura Lucas
an Egyptian man in the 500 c.e.
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It measures he amount of sunlight at a given location.
A German professor invented in in 1821. The British Army Signal Corp used it in the 1860s.
Guide, beam, flare, signal, sign, watchtower, alarm, alert, heliograph, lantern...
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.
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