7.1.1 - THE PICTORIAL EVOLUTION OF THE MICROPHONE
The M. Boudet microphone made in France.
Microphone model T-32 made in the USA circa 1943 for military application.
Microphone model 520, as kown as green bullet, made in 1950 by Shure Brothers in the USA
Condenser type modern microphone made by AKG in
High impedance microphone, serie 710, made in 1953 by Shure Brothers in the USA.
The microphone developed by Paul Bert and D'Arsonval in France.
Ader's receiver by using the electro-magnetic principle. In the right: technical details of its coils and the binder posts.
The velocity microphone model V-1 made in 1953 by Electro-Voice in the USA
Schematic showing another type of transmitter invented by Bell in 1885.