Henderson, C. Hanford (Charles Hanford), 1861-1941, Woodhull, John F. (John Francis), 1857-1941 · New York, D. Appleton and company · leaf 241
This is merely a magneticneedle free to move in a horizontal plane. It is attachedto the underside of a card (Fig. 123). This is inclosed ina box called the binnacle. A fixed line shows the directionof the keel of the ship, while the card, being carried about 218 PHYSICS by the compass needle,… … Fig. 123. reading for the declination of the needle, which he mustdetermine from tables and charts. The mariners compass appears to have been used bythe Chinese in very crude form long before it was knownto the Western world. It was discovered independently inEurope, perhaps in the twelfth century,…
Physics
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