Patent Model - Mode of Compensating the Local Attraction of the Magnetic Needle on Ships

Maker and role
Calvin Kline, Patentee
Production date
Mar 17 1857
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Object detail

Copper, brass, glass, iron
6 1/2 x 10" (16.5 x 25.4cm)
In his patent, Kline said: "My improvement consists in surrounding the compass-needle with an insulated shield of iron or steel, which I have found to protect the needle against all local attractions, while it is left to traverse freely by the natural magnetism of the earth, and it is found that with my device the compass traverses as freely and settles as quickly as the ordinary compass where no local attraction is present. (Patent Number 16,845)
Object number
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