Merchant, F. W. (Francis Walter), 1855-1937, Fessenden, Cortez, b. 1852 · Toronto : Copp, Clark · leaf 298
Pig. 234. The needle is placed in themagnetic meridian, levelled, andthe angle of inclination read from the graduated circle placed around it. MAGNETISM. 289 16. Mariners Compass. The mariners compass consists of a permanent magneton which is mounted a graduated card, the magnet beingso poised on a… … Fig. 285. Fig. 235 shows a common form of the instrument. Inside the compass-box is marked a vertical black linecalled the lubber line. The compass is so placed thatthis line is in the axis of the ship and indicates alwaysthe direction of the keel. The point of the compass atthe lubber line,…
Physics
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