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The multiple unit traction control system was developed by Frank Sprague and first applied and tested on the South Side Elevated Railroad (now part of the Chicago 'L') in 1897. In 1895, derived from his company's invention and production of direct current elevator control systems, Frank Sprague invented a multiple unit controller for electric ...
Elevators are another common application - large relay logic circuits were employed from the 1930s onward to replace the human elevator operator, but have been progressively superseded with modern solid-state controls in recent years. Relay logic is also used for controlling and automation purposes in electro-hydraulics and electro-pneumatics.
A modern digital test controller. Digital test controllers are devices (usually computer based) that provide motion control [1] by processing digital signals. Typically a controller has inputs connected to sensors on the device they control, which measure the feedback, its current state (for example the current position), and process this signal to provide an output to a hydraulical ...
Otis elevator in Glasgow, Scotland, imported from the U.S. in 1856 for Gardner's Warehouse, the oldest cast-iron fronted building in the British Isles [7] Otis founded the Otis Elevator Company in Yonkers, New York, in 1853. When he died in 1861 his sons Charles and Norton formed a partnership and continued the business.
In 2005, Schindler acquired the Hontz Elevator Company [1] after a brief legal battle with the German authorities over the registration of the company name. [citation needed] The court held that the Hontz Elevator Company had been established in the 19th century by Karl Hontz (then under the title Die Hontz Aufzugfirma) according to a folder of documents that had previously surfaced in the ...
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