1851 Great Exhibition: Official Catalogue: Class VIII.: Commander West
From Graces Guide
109. WEST, Commander, 1 James Street, Adelphi.
Marine compass, constructed on a principle which prevents the magnetic needle from oscillating more than one degree. Without this prevention the magnetic needle can oscillate forty-five degrees, viz., till the lower part of the cone touches the pivot, causing continual revolutions and vibrations. On the exhibitor's principle, the magnetic needle is always steady, and in the heaviest weather only vibrates four or five degrees.
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