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US Patent: 210,066
IMPROVEMENT IN MARINER'S COMPASSES
Magnetic compass deflector
Patentee:
William Thomson - Glasgow, Scotland

USPTO Classifications:
33/356, 33/359

Tool Categories:

Assignees:
None

Manufacturer:
Kelvin & James White, Ltd. - Glasgow, Scotland

Witnesses:
Charles J Gooch
A. H. Galt
David Drysdale Austin
Robert Adam Gunn

Patent Dates:
Applied: Dec. 21, 1877
Granted: Nov. 19, 1878

Patent Pictures: [ 1 | 2 ]
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Description:
Sir William Thomson, Lord Kelvin to Britishers, one of the world's most productive scientists and inventors, designed this device to facilitate the fine-tuning of the magnetic compasses of (especially) iron-hulled ships. There are pairs of magnets whose bottom ends can be separated by a left/right-handed calibrated screw so as to deflect the needle of the compass upon which the device is placed. The patent text thoroughly describes the procedure.

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