antik.it/Antique-compasses/7741-Nautical-Compass/
1700240985Code 7741 Nautical CompassLiquid compass on cardan joint and mounted on a mahogany wood base. English manufacture from the end of the 19th century. The compass is made up of a cylindrical container made of brass and copper, on the bottom of which is fixed a hard metal stem, on which the eight-wind rose is placed and complete with a goniometric circle suitably constrained, so that the zero coincides with magnetic polarity. In good condition, in perfect working order. To reduce friction to a minimum, the mortar is filled with a low freezing point liquid, which also has the purpose of quickly dampening any oscillations and closed at the top by a sturdy protective glass.
Compass diameter 13 cm – 5.2 inch, table dimensions 10.5x17.2 cm – 4.2x6.7 inch, height 13 cm – 5.2 inch.
The Greeks and Romans were still unaware of the possibility of exploiting magnetic fields to orient themselves, while it seems that this possibility was already known to the Chinese in some way: around 2600 BC. Emperor Hoang-Ti managed to defeat Prince Tchi-Yeou in battle thanks to a "magical" chariot, the See-Nan (south-indicating chariot). The emperor, thanks to this device, identified the enemy's escape route, even though the enemy had hidden it with a blanket of smoke: a human-shaped wooden silhouette was fixed on the chariot which rotated on itself and which, with the outstretched arm always pointed south (indicating the south obviously also indicated the north at the same time, but the south was considered by the Chinese to be the most important cardinal point). The Chinese also used their discoveries relating to magnetic fields as a form of entertainment and show: they threw magnetized arrows as if they were dice, and these aligned in a south-north direction as if by magic, which greatly impressed and amazed the spectators.
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Antique compasses
Code 7741 Nautical Compass
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