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CELESTION MOVING IRON LOUDSPEAKER, 1927
Before permanent magnets were made strong enough and cheap enough, loudspeakers used a coil moving an iron reed which was attached to the diaphragm of the speaker.
Internally a high resistance coil with a permanent magnet through it, was used to move an iron reed, this was attached to a rod on which was placed the paper cone. An Adjustment was provided for maximum efficiency. This method did not require a strong magnet to operate, and the quality was inferior to modern loudspeakers which use the moving coil principal.
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- I have two of the slightly smaller square versions of the Celestion. One was my grandfather's and came to me complete in it's original straw lined box. The balanced armature has a control knob on the rear. Like my two Brandes Radios, the Celestions are in dark and light wood finishes
.......... David Mills, Menai Bridge, Anglesey, North Wales, UK, 28th of November 2009
- Model C12 from 1927. The mechanisme is a reed system, so it is indeed a moving iron loudspeaker. Some more info can be found at http://www.hupse.eu/radio/celestion_c12.htm
.......... John Hupse, Schoonhoven, The Netherlands, 30th of August 2009