Strowger step-by-step automatic telephone exchange switch, 1897-1898

Made:
1897-1898 in United States
maker:
Strowger Automatic Telephone Company

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Creative Commons LicenseThis image is released under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 Licence

Buy this image as a print 

License this image for commercial use at Science and Society Picture Library

Strowger step-by-step automatic telephone exchange switch, probably Strowger Automatic Telephone Company, USA,
Science Museum Group Collection
© The Board of Trustees of the Science Museum

Strowger step-by-step automatic telephone exchange switch, probably Strowger Automatic Telephone Company, USA,
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.

On display

Science Museum: Information Age Gallery: Exchange

If you are visiting to see this object, please contact us in advance to make sure that it will be on display.

Related people

Details

DisplayLocation:
Science Museum, Information Age Gallery: Exchange
Category:
Telecommunications
Object Number:
1926-1052
type:
electric switch
taxonomy:
  • component - object
credit:
Donated by BT Heritage and Archives
status:
Permanent collection

Cite this page

Rights

We encourage the use and reuse of our collection data.


Data in the title, made, maker and details fields are released under Creative Commons Zero


Descriptions and all other text content are licensed under a Creative Commons Attribution 4.0 licence

Using our data

Download

Download catalogue entry as json

Our records are constantly being enhanced and improved, but please note that we cannot guarantee the accuracy of any information shown on this website.