7.1 - THE MICROPHONE

The microphone is a word originated from the Greek meaning: micro = small and phone = sound. It was developed with the first researches about the invention of the telephone started simutaneously by Elisha Gray and Alexander Graham Bell in 1876. Schemtic showing a transmitter used for telephone application ivented by Bell. The first magnetic transmitter invented by Bell. It was introduced by the inventor to the technological community in 1877 at the Essex Institute. Illustration of a transmitter, using an electro-magnet invented by Bell in 1876.