(Contributed by Ethan L.)
Technology: Induction Loop(s), also known as Telecoil or T-Coil
When it was invented: 1700’s, rediscovered in 1937
Inventor(s): Franklin, Faraday, Tesla and Poliakoff
Technology Purpose: Hearing assistive device. It is used to improve the environment surrounding and improve communication needs of Hard of Hearing.
How does/did it work? : Picks up magnetic field generated by telephone speaker coil, then converted to audio signal.