Wall telephone using a Blake transmitter, c 1880s.

Image number: 10212281

Wall telephone using a Blake transmitter, c 1880s.

The solid back transmitter led to improved transmission and began to replace the Blake transmitter in the 1890s. The early two box telephones, like this one, were converted to three, where the new transmitter arm replaced the middle box. Some of the older two box phones remained in use for local calls. This wall phone was manufactured by the United Telephone Company.

Image number:
10212281
Credit:
Science Museum/Science & Society Picture Library
Date taken:
12 January 2004 13:02
Image rights:
Science Museum