Strowger step-by-step automatic telephone exchange switch, 1897-1898
- Made:
- 1897-1898 in United States
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LicenseThis image is released under a CC BY-NC-SA 4.0
Licence
Buy this image as a print
BuyLicense this image for commercial use at Science and Society Picture Library
LicenseStrowger step-by-step automatic telephone exchange switch
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Strowger step-by-step automatic telephone exchange switch
Science Museum Group Collection
© The Board of Trustees of the Science Museum
Strowger step-by-step automatic telephone exchange switch, made by the Strowger Automatic Telephone Company, United States, 1897-1898
Strowger step-by-step automatic telephone exchange switch, made by the Strowger Automatic Telephone Company, United States, 1897-1898.
The Strowger switches operated using electromagnets to raise the switch arm. The first digit dialled raised the switch arm to the required level, which the second digit caused it to rotate to the desired contact point. This method of operation led to them being called either 'two motion' or 'step-by-step' switches. Up to 100 line connections were available on an exchange of this size.
Details
- Category:
- Telecommunications
- Object Number:
- 1926-1052
- Materials:
- metal (unknown), plastic (unidentified), rubber (unidentified) and leatherette
- Measurements:
-
overall: 360 mm x 110 mm x 135 mm, 2.14 kg
- type:
- electric switch
- credit:
- Donated by BT Heritage and Archives
