signal-lantern

This extraordinary man, living the life of a recluse in his own observatory, which was situated in a lonely part of the country, had, or at any rate, believed that he had, opened up a communication with the inhabitants of Mars, by means of powerful electric lights, flashing in the manner of a signal-lantern or heliograph.

A Trip to Venus John Munro 1889

It seemed to be the glimmer of a vessel's signal-lantern rising out of the curve of the sea.

The Man That Corrupted Hadleyburg and Other Stories Mark Twain 1872

Dead to windward he at last discovered a green light, which he had no doubt was the starboard signal-lantern of the Sylph.

All Adrift or The Goldwing Club Oliver Optic 1859

I could not make out the inscription on the river side of the monument and, seeing a signal-lantern tied to a scow moored to the bank near by, I untied it and by its light was able to read the tribute of the city to the memory of the priest and the explorer "who first of known white men had passed that way," having travelled, as it recites, "two thousand five hundred miles in canoes in one hundred and twenty days."

The French in the Heart of America John Finley 1901