heliograph
10 letters · noun · scores 3,000 in SpellHuntr
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
Heliograph in a sentence
It was a lieutenant and a couple of privates of the 8th Hussars, with a stand like a theodolite, which the artilleryman told me was a heliograph.
when we stood up at nightfall we saw, in the sunset, the sparkle of the heliograph above cities, on the far side of the horizon.
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