Compass Card

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“Plan and Transverse Section of Sir William Thomson’s Compass-card. B, Corrector for quadrantal error; C, Box for corrector; a, Aluminium boss; b, Central cap of sapphire; c, Cords connecting rim and boss; d, Magnets; e, Threads connecting magnets; f, Aluminium rim; f, Cords supporting magnets; g,g’, Knife edges for gimbals.” — Encyclopedia Britannica, 1893

Keywords

compass, sapphire, card, quadrantal, corrector, aluminium

Galleries

Compasses

Source

The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)

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