Expériences et observations sur l'électricité faites à Philadelphie en Amérique

By Benjamin Franklin

Page 40

de la bouteille, avant le commencement de l'opération
soit égale à 20; supposez encore qu'à chaque coups de tube, ou à chaque
tour du globe il y entre une quantité égale à 1; alors après le premier
coup la quantité contenuë dans le fil-d'archal & le dedans de la
bouteille sera 21, dans le dehors elle ne sera plus que 19: après le
second la partie intérieure aura 22, l'extérieure 18: & ainsi après le
le vingtième coup, la partie intérieure aura une quantité de feu
électrique égale à 40; celle de la partie extérieure sera égale à zero,
& l'opération finit là, car il n'en peut plus être poussé dans la partie
intérieure, lorsqu'il n'en peut plus être tiré de la partie extérieure.
Si vous essayez d'en introduire davantage il est rejetté par le
fil-d'archal, ou casse la bouteille avec un craquement sensible.

26. L'équilibre ne sauroit être rétabli dans la bouteille par la
communication _intime_ ou le contact des parties, mais seulement par une
communication formée au dehors de la bouteille entre l'intérieur &
l'extérieur, par le moyen de quelque corps conducteur qui les touche
tous deux, soit en même-tems, auquel cas l'équilibre est rétabli avec
une violence & une rapidité inexprimables; soit alternativement, auquel
cas il est rétabli par dégrés.

27. Comme il ne peut plus être poussé de feu électrique au dedans de la
bouteille, lorsque tout celui du dehors est épuisé; de même dans une
bouteille non encore électrisée, on ne sauroit en pousser dans le
dedans, lorsqu'il n'en peut sortir du dehors: ce qui arrive ou quand le
fond est trop épais, ou quand la bouteille est placée sur un corps
originairement électrique. Et réciproquement lorsque la bouteille est
électrisée, on ne peut tirer de son intérieur, qu'une assez petite
quantité de feu électrique, en touchant le fil-d'archal, à moins qu'une
quantité égale ne puisse en même-tems être renduë à l'extérieur. Ainsi
posez une bouteille électrisée sur un verre net, ou sur de la cire
séche, & vous aurez beau toucher le fil-d'archal, vous n'en pourrez
tirer d'étincelle. Posez-la sur un corps non électrique, touchez le
fil-d'archal, & le feu en sortira en très-peu de tems; mais il sortira
beaucoup-plus vîte encore, si vous formez une communication directe,
comme il a été dit ci-dessus, tant ces deux états d'électricité le
_plus_ & _le moins_ sont merveilleusement combinés, & balancés dans
cette bouteille miraculeuse; ils sont disposés & proportionnés entr'eux
d'une manière qui surpasse mon intelligence. La bouteille électrisée est
en sens contraire comme le récipient de la machine pneumatique, dont on
a vuidé l'air: si l'on ouvroit le robinet l'équilibre seroit rétabli
dans

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Collinson, Fellow of the Royal Society of London, a present of a glass tube, with some account of the use of it in making such experiments.
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