www.antik.it/Antique-compasses/7472-Pocket-Compass/
1672412390Code 7472 Pocket CompassPocket compass chrome plated brass with the shape of a pocket watch, with lid engraving K.F. Perkins 1907.
The compass has a snap-on cover with release button inside the ring. Compass card with eight winds complete with a goniometric circle for the calculation of horizontal angles. Very good condition fully functional. Diameter 5,3 cm – 2.15 inches, thick 1.6 cm - 0.6 inches.
The use of a magnetic needle is described by the Arab scientist Bailak Al Qabajaqi: in 1242 during a travel from Tripoli in Syria to Alexandria the captain of the ship used it, putting in a pail with water a piece of cork with a needle and magnetizing it with a magnet; the needle moved immediately in the North-South direction.
The Greeks and the Romans didn’t know the possibility to use magnetic fields for orient, but this possibility probably was known by the Chinese people: about in 2600 B.C. Hoang-Ti the emperor won Tchi-Yeou the prince using a magic cart, the See-Nan (cart indicating the South), finding the way of escape of the enemy that has been covered by smoke: on this cart there was a rotating human shaped figure with an arm stretched indicating the South (obviously indicating the North too, but the South was the most important cardinal point for the Chinese people). The Chinese people used magnetic fields also for spectacles: throwing magnetized arrows like dice, they indicated south like a magic, amazing the public.
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Antique compasses
Code 7472 Pocket Compass
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