ar or mouth piece, over whose end a diaphragm ducing the speaking current. pivoted armature of an electromagnet, so that in its is stretched, which diaphragm is made of gold beat- In 1856, Du Moncel had discovered that 'when two motions the armature would alternately push against er's skin. By… … fMV \v THE HOUSE TELEPHONE. MODERN CARBON OR MICROPHONE TRANSMITTER. by weak currents, and an ear placed opposite an ear to the oscillating armature of an electromagnet, and a a diaphragm was early abandoned, and a plate of iron piece leading to the diaphragm received the sound. battery is included…
Patents · Iron · Steel · Machine · Fifty years · Tons · Years ago · Electric light · Scientific American · Cast Iron · Sewing machine · Horse power · Electric motor · Half century · Twenty years
Internet Archive · Public domain (published before 1931). Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-229-99.webp)
