The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 42
ground that the contact between the carbon button and the platinumpoint is improved and deteriorated by movement of the diaphragm. Theindlarubber ring is most useful in that it prevents a vibration from con- … FlGURE I tinning after the originating sound has ceased. If a long loose chain isshaken from one end the movement travels slowly to the end. The chainis, in fact, moving after Qne has ceased to shake it. If our diaphragm 28 Hunnings Transmitter. vibrates after we have ceassd to send sound waves on…
Telephone · Postal service
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