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Leopold Jean Baptiste Drault
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Electric Propulsion And Braking For Vehicles
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Abstract
20,670. Drault, L. J. B. Sept. 21, 1906, [date applied for under Patents Act, 1901]. Armatures; motors, controlling.-For driving a Ruhmkorff-coil interrupter, an iron star-shaped wheel is placed in the field of the coil, which is provided with an iron core m. To vary the speed of rotation, the wheel is set at different distances from the core m, or is set on the shaft b at different angles; or the number of teeth in the wheel l and the interrupter-wheel a is altered.
GB190720670D1906-09-211907-09-17Improvements relating to Mercury Interruptors for Electric Currents.
ExpiredGB190720670A
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