Wiktionary
heliographs
n. (plural of heliograph English) vb. (en-third-person singular of: heliograph)
Usage examples of "heliographs".
On October 31st the force remained on the defensive, but early on November 1st the gleaming of two heliographs, one to the north-east and one to the south-west, told that two British columns, those of De Lisle and of Barter, were hastening to the rescue.
The burghers in the valley below could see all day the twinkle of British heliographs from every hill, while at night the constant flash of signals told of the sleepless vigilance which hemmed them in.
Far on the flanks the twinkling heliographs revealed the position of the wide-spread wings.