ClipArt ETC
An interior view of the chemical telephone.

Chemical Telephone

An interior view of the chemical telephone.

An illustration of one of the early telephones, known as a chemical telephone. Some used a liquid transmitter, some had a metal diaphragm that induced current in an electromagnet wound around a permanent magnet, and some were "dynamic" - their diaphragm vibrated a coil of wire in the field of a permanent magnet or the coil vibrated the diaphragm.

Chemical Telephone

An illustration of one of the early telephones, known as a chemical telephone. Some used a liquid transmitter,…