Atkinson, Philip. [from old catalog] · New York, The Century co. · leaf 244
THE TELEGRAPH AND TELEPHONE. 221 … employed for this purpose j opposite which is mounted a diaphragm a, like that in the Bell receiver. Just behind this is a little carbon disk, b, attached to a brass disk, suspended by a metal spring c, so that the carbon disk comes opposite the center of the diaphragm. The end of another spring,…
Electricity
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