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'THE THINKER' MOVING IRON LOUDSPEAKER, 1940's
Extension Loudspeaker for transferring the wireless to other rooms, with fret cut out to the shape of 'The Thinker' sculpture.
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On the the rear view can be seen the adjustment control for the Moving Iron Loudspeaker, it was necessary to occasional correct the clearance of the reed or armature, to keep the unit working properly if this was not done loud volumes would cause thumping or sticking, the unit needed to be able to give good sensitivity for all volume levels.
Bruce Hammond Collection