'Sterling-Primax' pleated diaphragm loudspeaker.
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'Sterling-Primax' pleated diaphragm loudspeaker.
Science Museum Group
© The Board of Trustees of the Science Musuem
'Sterling-Primax' pleated diaphragm loudspeaker.
The main feature of this loudspeaker is its pleated diaphragm. This was introduced by Lumiere in 1908. The moving-iron unit that drives the paper diaphragm has been sectioned to show its workings in great detail.
Details
- Category:
- Radio Communication
- Object Number:
- 1933-463
- type:
- loudspeaker
- credit:
- Major Osborne Wills
