A microphone is a device for converting acoustic power into electric power, which has essentially similar characteristics. Microphones convert sound waves into electrical voltages that are eventually converted back into sound waves thru speakers.
Antique microphones were first used with early telephones and then radio transmitters. With the invention of the radio, however, new broadcasting microphones were created.
Manufacturers of antique microphones include the antique Webster Microphones, antique microphones by Shure Brothers Microphones, the antique RCA or ABC or CBS microphones, and antique microphones by ElectroVoice.