Tests are carried out in a soundproof room at Post Office Engineering Research Station.
The Post Office Engineering Research Station carries out tests to reduce noise in telephone earpieces. Location of events unknown.
M/S man sat in electric chair in padded room, camera pans up and down him and across to a loudspeaker. C/U wall made from fibreglass in muslin bags. L/S as the door opens and a man walks in. Various shots as the man attaches microphone and other instruments to the other man's head and ears. C/U of the man's ear, with needle sticking into it. M/S man working controls and amplifier. M/S man checking controls and writing in book. C/U Cathode-ray shows screen sequences moving across it. L/S man seated in soundproof room.