Bibliographical history of electricity & magnetism, chronologically arranged
History
Bibliographical history of electricity & magnetism, chronologically arranged
Electricity -- History; Electricity -- History -- Bibliography; Magnetism -- History; Magnetism -- History -- Bibliography; Science, Medieval
=A.D. 1665.=--Glanvill (Joseph), an eminent English divine and
philosopher, Chaplain to King Charles II and F.R.S., sometimes
called “Sadducismus Triumphatus Glanvill,” endorses in his “Scepsis
Scientifica” (“the vanity of dogmatizing recast”)--published originally
in 1661--the views advanced previously by the Jesuit Leurechon, and,
after discussing the objections of Sir Thomas Browne, expresses the
belief that “to confer at the distance of the Indies by sympathetic
conveyances may be as usual to future times as to us in literary
correspondence.”
A writer in the “Bath Chronicle” reproduced a long extract from
Glanvill’s work, the concluding sentence of which, he says, seems to
have anticipated the electric telegraph. It is as follows: “But yet
to advance another instance. That men should confer at very distant
removes by an extemporary intercourse is a reputed impossibility; but
yet there are some hints in natural operations that give us probability
that ’tis feasible, and may be compassed without unwarrantable
assistance from demoniack correspondence. That a couple of needles
equally touched by the same magnet, being set in two dials exactly
proportioned to each other, and circumscribed by the letters of the
alphabet, may effect this ‘magnale’ (_i. e._ important result)
hath considerable authorities to avouch it.
“The manner of it is thus represented: Let the friends that would
communicate take each a dial, and, having appointed a time for their
sympathetic conference, let one move his impregnate needle to any
letter in the alphabet, and its affected fellow will precisely respect
the same. So that, would I know what my friend would acquaint me with,
’tis but observing the letters that are pointed at by my needle, and
in their order transcribing them from their sympathized index, as its
motion directs; and I may be assured that my friend described the same
with his, and that the words on my paper are of his inditing. Now,
though there will be some ill-contrivance in a circumstance of this
invention, in that the thus impregnate needles will not move to, but
avert from each other (as ingenious Dr. Browne hath observed), yet this
cannot prejudice the main design of this way of secret conveyance;
since it is but reading counter to the magnetic informer, and noting
the letter which is most distant in the Abecederian circle from that
which the needle turns to, and the case is not altered.
“Now, though this desirable effect may possibly not yet answer the
expectations of inquisitive experiment, yet ’tis no despicable item,
that by some other such way of magnetick efficiency it may hereafter
with success be attempted, when magical history shall be enlarged by
riper inspections; and ’tis not unlikely but that present discoveries
might be improved to the performance.”
Glanvill is also the author of “Philosophical Considerations Touching
Witches and Witchcraft,” 1666, and of “The Sadducismus Triumphatus,”
1681.
Public-domain text, read in full here on John Shaqi.
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