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pilot lamp

noun

  1. an electric lamp, used in association with a control, which by means of position or color indicates the functioning of the control; an indicator light or a control light.


pilot lamp

noun

  1. a small light in an electric circuit or device that lights up when the circuit is closed or when certain conditions prevail
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word History and Origins

Origin of pilot lamp1

First recorded in 1880–85
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Example Sentences

This controls, as already described, the circuit of the pilot lamp common to the same group of line lamps.

Ignoring at first the pilot relay and the pilot lamp, it will be seen that each of the tip-spring anvils of the jacks is connected to a common wire 1 which is grounded.

The details of the operator's cord circuit and of the pilot lamp and night alarm circuits will be clear from the diagram.

When it does attract its armature it causes illumination of the pilot lamp in the same way that the line relays cause the illumination of the line lamps.

This pulls up the line relay and lights the line lamp, the pilot relay also pulling up and lighting the common pilot lamp which is not shown.

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