US Patent: 871,220
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| Controller
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Patent Dates:
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| Applied: |
Oct. 31, 1906 |
| Granted: |
Nov. 19, 1907 |
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"Vintage Machinery" entry for Allis-Chalmers Manufacturing Co.
"Vintage Machinery" entry for Bullock Electric Manufacturing Co.
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Description: |
| "My invention relates to controllers for electric motors and particularly to series-parallel controllers of the drum type. In the operation of modern electric railway cars, especially those employed in inter-urban traffic, a number of motors, usually four, are required. These motors are of large capacity and draw heavy currents from the line and the difficulty of handling and properly controlling the current supplied to them becomes very great..." |
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