Strowger switch
Videos
The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1
Western Electric 7A Rotary, friction drive (Bird-cage), No. 7001 Line Finder. Note the driven bevel gear on the right-hand side; this type has a steady rotary motion and does not employ an electromagnet for stepping.
Bank of two-motion switches
British SXS two-motion contact bank
Télégraphie, Systeme Strowger
Stepping switch
Videos
In electrical engineering, a stepping switch or stepping relay, also known as a uniselector, is an electromechanical device that switches an input signal path to one of several possible output paths,
Strowger switch
…The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger. Based on its…
An array of uniselector stepping switches as installed in a telephone exchange. The silver dials show the current position of the moving wipers. The fixed feeder brushes are barely visible.
Several views of a Type 206A stepping relay
Wiring terminals, unit is a 22-position, six-layer switch