antik.it/Antique-compasses/7375-Nautical-Compass/
1665665678Code 7375 Nautical CompassNautical compass on cardan joint signed DIRIGO Eugen M. Sherman Seattle USA from the 1920s, mounted on a custom made walnut board. Eight wind rose complete with protractor circle. The compass is made up of a cylindrical vessel in brass and bronze, called a mortar, on the bottom of which a hard metal stem is fixed, on which the wind rose is suitably constrained, so that the zero coincides with the magnetic polarity.
Diameter compass cm 10,5 – inch 4.4, wooden board width cm 18,3 – inch7.4, height cm 11- inch 4.5
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 7375 Nautical Compass
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