Rotary system
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The rotary machine switching system, or most commonly known as the rotary system, was a type of automatic telephone exchange manufactured and used primarily in Europe from the 1910s. The system was de
Western Electric friction drive Line Finder (No. 7001 type)
An example of a Western Electric 7A Rotary (Bird-cage) Line Finder assembly. The horizontal shaft is driven by a gear and when the Line Finder's electromagnet is energized, a flexible disc at the base of the Line Finder's brush carriage is engaged through friction to the horizontal shaft's driving disc, causing the brush carriage to rotate.
Strowger switch
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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
Rotary system
…in England at Darlington (10 October 1914) and Dudley (9 September 1916). However the British General Post Office standardised on the Step-by-Step (SXS) system in 1922, and subsequently the SXS Director system for London and other large cities. Six Rotary exchanges were installed in the city of Hull…
Bank of two-motion switches
British SXS two-motion contact bank
Télégraphie, Systeme Strowger