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A system of white, blue, green and red lights, that could be made to shine continuously or flicker, was used by the commander to direct the driver when buttoned up, based on a predetermined signal code: Forward: continuous white light. To the left: continuous blue light. To the right: continuous green light. Backwards: flickering white light.
Two light switches in one box. The switch on the right is a dimmer switch. The switch box is covered by a decorative plate. The first light switch employing "quick-break technology" was invented by John Henry Holmes in 1884 in the Shieldfield district of Newcastle upon Tyne. [1]
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3/4 front-left view of British Rail Bardic hand-lamp. The Bardic Rail Signalling Lamp was the original name of a particular type of battery powered railway signalling handlamp made from 1962 by Bardic, Ltd. [1] for use by rail and trackside workers.