rubber ring at the bottom ofthe case. The diaphragm at its points of con-tact with the magnets is freed from japan oroxide, and the ends of the magnets are let into notches cut inthe case, so that when they press upon the diaphragm thelatter is backed by the mouthpiece. This receiver is very… … SIMPLE TELEPHONE TRANSMITTER. Telephonic Electric Condensers. In order to make a condenser sing it is merely needful toconnect its armatures with the extremities of the secondaryhelix of an induction coil, interposing in the primary helixa battery and a microphone analogous to the transmitter…
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