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Expired
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Elmor Randolph Carrington
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Individual
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Individual
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Publication of GB190808781ApublicationCriticalpatent/GB190808781A/en
8781. Carrington, E. R. April 22. Speaking-tubes.-Tramcars and other passenger vehicles are fitted with apparatus as shown to allow announcements to be made to passengers by the driver or attendant. A mouthpiece 15 ccmmunicates with a resonance-box 14, from which sound is conveyed through a telescopic connexion 12 to a tube 9 terminating within the vehicle in a trumpet-mouth 8. The tube 9 is arranged within the roof 11 of the vestibule.
GB190808781D1908-04-221908-04-22Improvements in or connected with Speaking-tubes and like Communicating Apparatus for Passenger Vehicles.
ExpiredGB190808781A
(en)