In 1931 This text appears in  Telephony Magazine: "It was customary in the past to refer to the bridge back transmitter as standard...

The microphone is easy to forget. I forget that there's one built into my answering machine and my mp3 player. They all descend from one...

The first Microphone was the Carbon Microphone. The word "microphone" comes from the Greek word "micro", which means ...