Experiments and Observations on Electricity Made at Philadelphia in America

By Benjamin Franklin

Page 17

a quire of paper is thought good armour against the push
of a sword or even against a pistol bullet) and the crack is exceeding
loud. The operator, who holds the picture by the upper-end, where the
inside of the frame is not gilt, to prevent its falling, feels nothing of
the shock, and may touch the face of the picture without danger, which he
pretends is a test of his loyalty.--If a ring of persons take the shock
among them, the experiment is called, _The Conspirators_.

21. On the principle, in s 7, that hooks of bottles, differently charged,
will attract and repel differently, is made, an electrical wheel, that
turns with considerable strength. A small upright shaft of wood passes at
right angles through a thin round board, of about twelve inches diameter,
and turns on a sharp point of iron fixed in the lower end, while a strong
wire in the upper-end passing thro' a small hole in a thin brass plate,
keeps the shaft truly vertical. About thirty _radii_ of equal length, made
of sash glass cut in narrow strips, issue horizontally from the
circumference of the board, the ends most distant from the center being
about four inches apart. On the end of every one, a brass thimble is fixed.
If now the wire of a bottle electrified in the common way, be brought near
the circumference of this wheel, it will attract the nearest thimble, and
so put the wheel in motion; that thimble, in passing by, receives a spark,
and thereby being electrified is repelled and so driven forwards; while a
second being attracted, approaches the wire, receives a spark, and is
driven after the first, and so on till the wheel has gone once round, when
the thimbles before electrified approaching the wire, instead of being
attracted as they were at first, are repelled, and the motion presently
ceases.--But if another bottle which had been charged through the coating
be placed near the same wheel, its wire will attract the thimble repelled
by the first, and thereby double the force that carries the wheel round;
and not only taking out the fire that had been communicated to the thimbles
by the first bottle, but even robbing them of their natural quantity,
instead of being repelled when they come again towards the first bottle,
they are more strongly attracted, so that the wheel mends its pace, till it
goes with great rapidity twelve or fifteen rounds in a minute, and with
such strength, as that the weight of one hundred _Spanish_ dollars with
which we once loaded

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Text Comparison with Autobiography of Benjamin Franklin

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before treated me.
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In behalf of the Assembly, I urged all the various arguments that may be found in the public papers of that time, which were of my writing, and are printed with the minutes of the Assembly; and the governor pleaded his instructions, the bond he had given to observe them, and his ruin if he disobey'd, yet seemed not unwilling to hazard himself if Lord Loudoun would advise it.
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The last time I saw your father was in the beginning of 1724, when I visited him after my first trip to Pennsylvania.
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Of the Means of disposing the Enemy to.
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_ 1789.