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Updated: June 3, 2025
A Third Kind of Simple Loud Speaker. The sounds set up by the headphone are conveyed to the apex of an inverted copper cone which is 7 inches long and 10 inches in diameter. Here it is reflected by a parabolic mirror which greatly amplifies the sounds. The amplification takes place without distortion, the sounds remaining as clear and crisp as when projected by the transmitting station.
A further difference between them is that the wireless headphone is made as sensitive as possible so that it will respond to very feeble currents, while the ordinary telephone receiver is far from being sensitive and will respond only to comparatively large currents. How a Bell Telephone Receiver Is Made.
In the better makes of microphone transformer, there is a third winding, called a side tone coil, to which a headphone can be connected so that the operator who is speaking into the microphone can listen-in and so learn if his transmitter is working up to standard. The Magnetic Modulator.
A Third Kind of Simple Loud Speaker. The sounds set up by the headphone are conveyed to the apex of an inverted copper cone which is 7 inches long and 10 inches in diameter. Here it is reflected by a parabolic mirror which greatly amplifies the sounds. The amplification takes place without distortion, the sounds remaining as clear and crisp as when projected by the transmitting station.
You can use No. 40 double cotton covered magnet wire, in which case you will have to shellac the tube and the wire after you get it on. Instead of leaving the wires outside of the tube bring them to the inside of it and then out through one of the open ends. This will cost you 25 or 50 cents. The Headphone.
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