Camera and hood for photographing 'phone-call meters, c 1965.
© Science Museum / Science & Society Picture Library
Equipment used for photographing customers' telephone-call meters. The process of billing customers for their telephone calls was made significantly easier by photographing the meters in batches using a specially-adapted camera. The readings could be transcribed more comfortably in another part of the exchange and a permanent record resulted which was useful evidence in case of dispute.