The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 42
f a spring M fixed to both. The screw V serves to regulatethe amount of pressure between the platinum point and the carbon button.The diaphragm is fitted into the indiarubber ring RR, and is held inposition by means of two springs E and E (Figure 17) fixed to the circular Blah Transmitter. 27 ring… … 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-
Telephone · Postal service
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