Primax moving iron loudspeaker, c 1924.
4 0 c m
 
34cm
actual image size: 26cm x 32cm

Primax moving iron loudspeaker, c 1924.

© Science Museum / Science & Society Picture Library

Description

Serling Primax loudspeaker, with pleated diaphragm. Before modern moving-coil loudspeakers, most people listened to the radio on headphones. A speaker, if you had one, would probably have fixed coils driving an iron reed attached to a small diaphragm.
 

Image Ref.

10251415
 

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