Revolving light

a light or lamp in a lighthouse so arranged as to appear and disappear at fixed intervals, either by being turned about an axis so as to show light only at intervals, or by having its light occasionally intercepted by a revolving screen.

See also: Revolving

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in classic literature ?
The great revolving light on the cliff at the channel flashed warm and golden against the clear northern sky, a trembling, quivering star of good hope.
Whenever it came back, the eyes of all on board, brightened and sparkled like itself: and there we all stood, watching this revolving light upon the rock at Holyhead, and praising it for its brightness and its friendly warning, and lauding it, in short, above all other signal lights that ever were displayed, until it once more glimmered faintly in the distance, far behind us.
She insists upon this preposterous scheme of being a pilot, and will talk of nothing but revolving lights and hidden rocks, and codes of signals, and nonsense of the kind."
The police spotted a luxury car with flashing blue revolving light and Pakistan's flag on its front recklessly driven in Naseerabad area.
A police spokesman said here on Saturday that a police team intercepted a suspected car with blue revolving light near Nalka-Kohala Chowk for checking.
NABBED: A man was arrested with blue revolving light on his car.
SIU team recovered 30 bore pistol along with ammunition, blue revolving light, commando uniform along P-cap, fake wireless set sand white corolla from the nabbed persons identified as Sardar Wali s/o Lashkari Khan r/o Dhok Jellani, Bhara Kahu Islamabad.
The arching, melting, twirling solo for Daniel Proietto seemed to blend in with the revolving light on the floor.
It's got an orange revolving light on the roof because once it and its owner were nearly flattened by a truck that hadn't seen it.
The blaring of a siren and a revolving light will greet the arrival of each miner as they emerge from the depths of the mine.
Andy Warhol's The Shadow, 1981 (top), and Mona Hatoum's Misbah (above), a revolving light which creates images of men with guns.