heliograph

Definition

An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.

Etymology

From helio- + -graph.

Example Sentences

• "Now Jones had left his new-wed bride to keep his house in order, / And hied away to the Hurrum Hills above the Afghan border, / To sit on a rock with a heliograph; but ere he left he taught / His wife the working of the Code that sets the miles at naught. / And Love had made him very sage, as Nature made her fair; / So Cupid and Apollo linked, per heliograph, the pair."
• "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."