Signal lamp

A signal lamp (sometimes called an Aldis lamp, after Arthur Cyril Webb Aldis who invented a widely used design, or a Morse lamp) is a visual signaling device for optical communication, typically using Morse code. Modern signal lamps are focused lamps which can produce a pulse of light. In large versions, this pulse is achieved by opening and closing shutters mounted in front of the lamp, either via a manually operated pressure switch or, in later versions, automatically. With hand held lamps, a concave mirror is tilted by a trigger to focus the light into pulses. The lamps were usually equipped with some form of optical sight, and were most commonly used on naval vessels and in airport control towers (using color signals for stop or clearance).

Signal lamps were pioneered by the British Royal Navy in the late 19th century and continue to be used through the present day, on naval vessels. They provide handy, secure communications, which is especially useful during periods of radio silence and were particularly useful for convoys operating during the Battle of the Atlantic.

There are several types. Some signal lamps are mounted on the mastheads of ships, some small hand-held versions are also used (e.g., the 'Aldis lamp'); other more powerful versions are mounted on pedestals. These larger ones use a carbon arc lamp as their light source, with a diameter of 20 inches (50 cm). These can be used to signal to the horizon, even in conditions of bright sunlight. Although it was originally thought that it was only possible to communicate by line-of-sight, in practice it is possible to illuminate cloud bases both during the night and day, which allow for communication beyond the horizon.

The maximum transmission rate possible via flashing lights is no more than 14 wpm. They have a secondary function as simple spotlights.

The idea of flashing dots and dashes from a lantern was first put into practice by Captain, later Vice Admiral, Philip Colomb, of the British Royal Navy, in 1867. His original code, which the Navy used for seven years, was not identical with Morse's, but Morse code was eventually adopted with the addition of several special signals.

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