Text-book of general physics, for the use of colleges and scientific schools (1899)
Hastings, Charles Sheldon · Boston: Ginn & company · leaf 380
card, as it is usually called, is about 170grains (11 grams), and its period about 42 sec. To keep the card horizontal and shield it from tremors inthe ship, the compass bowl is carried by a gimbal ring sup-ported on knife edges resting on stirrups which are hung bychains from an elastic wire ring… … Fig. 230. 370 MAGXETISM. the iron in the cargo, the ship or her fittings, cannot be per-manently corrected on account of the erratic variations inthe ships magnetism. That portion which is approximatelypermanent may be counteracted by magnets placed in theneighborhood of the compass: likewise, that…
Physics
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