
3 1 c m
40cm
actual image size: 32cm x 23cm
Description
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.
Image Details
Image Ref.
10460768
© Science Museum / Science & Society Picture Library