With Respect To The Chinese, The Point
In Dispute Is Not So Easily Determined:
It is generally imagined, that they
derived their knowledge of the compass from Europeans:
But Lord Macartney,
certainly a competent judge, has assigned his reasons for believing that
the Chinese compass is original, and not borrowed, in a dissertation
annexed to Dr. Vincent's Periplus of the Erythrean Sea. At what period it
was first known among them, cannot be ascertained; they pretend that it was
known before the age of Confucius. That it was not brought from China to
Europe by Marco Polo, as some writers assert, is evident from the
circumstance that this traveller never mentions or alludes to it. The first
scientific account of the properties of the magnet, as applicable to the
mariner's compass, appears in a letter written by Peter Adsiger, in the
year 1269. This letter is preserved among the manuscripts of the university
of Leyden; extracts from it are given by Cavallo, in the second edition of
his Treatise on Magnetism. From these extracts it is evident that he was
acquainted with the attraction, repulsion, and polarity of the magnet, the
art of communicating those properties to iron, the variation of the
magnetic needle; and there are even some indications that he was acquainted
with the construction of the azimuth compass.
Next in importance and utility to the mariners' compass, in preparing the
way for the great discoveries by which the fifteenth century is
distinguished, maps and charts may be placed.
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