The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 103
abased pyramids. The instrument issometimes called the Hunningscone transmitter. Thejunctions of the bases of the pyramids of one row areopposite the middle lines of the bases in the adjoining rows.Only the centre portion of the block is used, the other partbeing covered with a thick pad of cotton… … Fig. 70. —Scale $ ment is the shapeelectrode. This,number of square TRANSMITTERS IN PRACTICAL USE 8i outer carbon diaphragm, to damp the vibrations of the latter.and to prevent packing by retaining portions of thecarbon granules en-tangled among the fila- ^ ~^-^.ments. As the instru-ment is not…
Telephone
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