From the 1920s through the 1980s most electrically driven elevators used Ward Leonard control and many systems remained in use at the beginning of the 21st century.
2.
Tustin compared Ward Leonard control systems, Metadynes and Amplidynes, and accepted that each had its merits, but favoured the Metadyne, of which he had several years experience from their use in traction control.
3.
In a parallel order 100 similarly rated locomotives were made by British Westinghouse, who were probably the original designers, though the DC generator / DC motor speed control mechanism is an early example of the application of a Ward Leonard control system ( Harry Ward Leonard patented its application to vehicles in 1903 ).
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