The Complete Works in Philosophy, Politics and Morals of the late Dr. Benjamin Franklin, Vol. 1 [of 3]

By Benjamin Franklin

Page 186

as if it
flowed from the finger; on the glass globe it is otherwise. 4. The
cool wind (or what was called so) that we used to feel as coming from
an electrified point, is, I think, more sensible when the glass globe
is used, than when the sulphur one.--But these are hasty thoughts. As
to your fifth paradox, it must likewise be true, if the globes are
alternately worked; but if worked together, the fire will neither
come up nor go down by the chain, because one globe will drink it as
fast as the other produces it.

I should be glad to know, whether the effects would be contrary if
the glass globe is solid, and the sulphur globe is hollow; but I have
no means at present of trying.

In your journeys, your glass globes meet with accidents, and sulphur
ones are heavy and inconvenient.--_Query._ Would not a thin plane of
brimstone, cast on a board, serve on occasion as a cushion, while a
globe of leather stuffed (properly mounted) might receive the fire
from the sulphur, and charge the conductor positively? Such a globe
would be in no danger of breaking[64]. I think I can conceive how it
may be done; but have not time to add more than that I am,

Yours, &c.

B. FRANKLIN.

FOOTNOTE:

[64] The discoveries of the late ingenious Mr. Symmer, on the
positive and negative electricity produced by the mutual friction of
white and black silk, &c. afford hints for farther improvements to be
made with this view.


[In Mr. Collinson's edition, several papers followed here, by
the Abbé Mazeas, and others, upon the subject of Dr. Franklin's
experiments, which, that the letters of our author might not be too
much interrupted, we have thought proper to transfer to an Appendix.
A subsequent paper by Mr. David Colden, entitled Remarks on the Abbé
Nollet's Letters to Benjamin Franklin, esq. on Electricity, will be
found transferred in the same manner.]




TO PETER COLLINSON, ESQ. F. R. S. LONDON.

_Electrical Kite._


_Philadelphia, Oct. 19, 1752._

SIR,

As frequent mention is made in public papers from Europe of the
success of the Philadelphia experiment for drawing the electric
fire from clouds by means of pointed rods of iron erected on high
buildings, &c. it may be agreeable to the curious to be informed that
the same experiment has succeeded in Philadelphia, though made in a
different and more easy manner, which is as follows:

Make a small cross of two light strips

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Text Comparison with The Autobiography of Benjamin Franklin

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