A History of Inventions, Discoveries, and Origins, Volume 1 (of 2)Beckmann, Johann
History
A History of Inventions, Discoveries, and Origins, Volume 1 (of 2)
Beckmann, Johann
Inventions -- History
[221] I shall here lay before the reader the whole passage, taken from
Histoire de l’Académie for 1717, p. 7:--“Here we have a small magnet.
It is a stone found in a river of the island of Ceylon. It is of the
size of a denier, flat, orbicular, about the tenth part of an inch in
thickness, of a brown colour, smooth and shining, without smell and
without taste, which attracts and afterwards repels small light bodies,
such as ashes, filings of iron, and bits of paper. It was shown by M.
Lemery. It is not common, and that which he had cost twenty-five livres
(about twenty shillings sterling). When a needle has been touched with
a loadstone, the south pole of the loadstone attracts the north pole
of the needle, and repels its south pole: thus it attracts or repels
different parts of the same body, according as they are presented to
it, and it always attracts or repels the same. But the stone of Ceylon
attracts, and then repels in the like manner, the same small body
presented to it: in this it is very different from the loadstone. It
would seem that it has a vortex....”
[222] “I must not omit to mention that the rivers contain the electric
stone, which is of the size of a halfpenny, flat, orbicular, shining,
smooth, of a brown colour, one-tenth of an inch in thickness, without
smell and without taste, and which attracts light bodies, such as
ashes, filings of iron, shavings of paper, &c., and afterwards repels
them. A wonderful and singular property, discovered and observed in
this stone alone, when neither heated by motion nor by friction.”
Public-domain text, read in full here on John Shaqi.
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