
4 0 c m
34cm
actual image size: 26cm x 32cm
Description
The Marconi ribbon microphone was used by the BBC until 1959. The tiny presure changes, caused by the aluminium ribbon which is les than a thousandth of a millimetre thick, vibrate between the poles of a large magnet. These generate currents which mimic the sound wave. A radio microphone is a transducer, which is a device that translates voltages and currents into sounds, lights or forces.
Image Details
Image Ref.
10305879
© Science Museum / Science & Society Picture Library