US Patent: 498,763 - Electro-motive device


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US Patent: 498,763

Electro-motive device

Patentee:

Romaine Callender (exact or similar names) - Brantford, ON Canada

USPTO Classifications:

178/98, 361/154

Tool Categories:

Assignees:

Edward L. Goold - Brantford, ON Canada

Edward Hart - Brantford, ON Canada

Romaine Callender - Brantford, ON Canada

Manufacturer:

Not known to have been produced

Witnesses:

Charles B. Heyd

William Frank

Patent Dates:
Applied:	Jul. 14, 1892
Granted:	Jun. 06, 1893

Patent Pictures:

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Description:

The invention is a method of creating electromagnetic devices, such as solenoids, where the force exerted is a function of position, as controlled by a rheostatic circuit.