blue light

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A pyrotechnical preparation, also known as a Bengal light. Before the introduction of more modern methods of signals at sea, it was used at night, in conjunction with gunfire, to transmit the orders of the admiral of a squadron or fleet. By counting the number of gunshots fired, and observing the blue lights shown, the captain of a man-of-war could interpret through his night signal book what order the admiral was making.

Subjects: Maritime History.

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