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Expired
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William Kennedy-Laurie Dickson
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Individual
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Individual
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Publication of GB190828135ApublicationCriticalpatent/GB190828135A/en
28,135. Dickson, W. K.-L. Dec. 24. Switches.-Advertisements on trains, trams, sandwich-boards, and other moving bodies are intermittently illuminated by electric lamps which are controlled by switches operated by the vibration of the bodies. The switch shown in Fig. 1 consists of a spring-arm a carrying an adjustable weight b and contacts c, which are caused by the vibrations to engage fixed contacts d, e. The switch shown in Fig. 2 consists of a tube a of insulating-material provided with pairs of contacts c, which are bridged successively by a ball d as it rolls to-and-fro.
GB190828135D1908-12-241908-12-24Improvements in Electrical Advertising Devices.
ExpiredGB190828135A
(en)