The telephone system of the British post office. A practical handbook (1901)
Herbert, Thomas Ernest · London, New York, Whittaker and Co. · leaf 39
l).HI. Granular Transmitters.The first two classes are very nearly identical—in fact, every transmittermight with propriety be regarded as a modification of the Hughesinstrument. The third class is very different in form, to the first two,and to it belong many of the most efficient instruments now… … C* 3= Figure 15. but rapidly gave way to the more powerful Gower. The Cower consistsof a central block of circular carbon C (Figure 15), from which radiateeight carbon pencils, each terminating at a carbon block. The four righthand blocks are connected by a strip of copper, and form one terminal of…
Telephone · Postal service
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