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

By Benjamin Franklin

Page 125

une petite lumière au
bout de cette pointe. Mais cette lumière n'est pas la même, quand le
corps est électrisé positivement, & quand il l'est négativement. Dans le
premier cas ce n'est qu'un petit floccon de lumière que M. le Roi nomme
point lumineux plus ou moins apparent, fort semblable à un ver luisant.
Dans le second cas cette lumière est en forme d'aigrette plus ou moins
longue, plus ou moins divergente, suivant la force de l'électricité.
C'est ce qu'on peut aisément...

[Manque la page 176]

...me je viens de le dire, étoit attachée tantôt au crochet & tantôt au
ventre de la bouteille. En un mot l'endroit où paroît l'aigrette est
celui d'où sort le feu, & conséquemment celui où est l'électricité
positive; & l'endroit où paroît le point lumineux est celui où elle est
négative.

«Les termes d'électricité positive & électricité négative ne doivent
jamais s'entendre dans un sens absolu. Le point lumineux que j'apperçois
quand je présente une pointe au conducteur électrisé par le globe de
verre ne prouve pas que je sois électrisé négativement, puisque j'ai
toujours ma quantité naturelle d'électricité, mais seulement que j'en
suis moins chargé que le conducteur, que j'en reçois de lui, que je suis
dans un état négatif par rapport au sien, et par conséquent que le sien
est positif relativement au mien.

À l'égard de votre cinquiéme paradoxe, il peut pareillement être vrai,
si les globes travaillent alternativement, mais s'il le font en même
tems, le feu ne montera ni ne descendra par la chaîne, parce qu'un globe
pompera le feu aussi vîte que l'autre le produira. Je ne serois pas
fâché de sçavoir si les effets seroient contraires dans le cas où le
globe de verre seroit solide & celui de soufre creux, mais je n'ai
présentement aucun moyen de l'essayer.

Dans vos voyages vos globes de verre sont sujets à des accidens, ceux de
soufre sont lourds & incommodes.»

_Quest._ Une plaque mince de soufre mise sur une table ne serviroit-elle
pas de coussin dans l'occasion, pendant qu'un globe de cuir rembourré
exactement, proprement monté, recevroit le feu du soufre & chargeroit le
conducteur positivement, un pareil globe ne courroit aucun danger d'être
cassé. Je crois concevoir comment cela pourroit s'exécuter. Mais je n'ai
pas le tems d'ajouter autre chose si ce n'est que je suis, Monsieur, &c.




_LETTRE X._

_De B. FRANKLIN Écuyer de Philadelphie._

_19. Octobre 1752._

Comme l'on parle souvent dans les nouvelles d'Europe du succès de
l'expérience de Philadelphie, pour tirer le feu électrique des nuées par
le moyen des verges de fer pointuës élevées sur le haut des bâtimens,
&c. Les curieux ne seront peut-être pas

Last Page Next Page

Text Comparison with Autobiography of Benjamin Franklin

Page 0
] AUTOBIOGRAPHY OF BENJAMIN FRANKLIN WITH ILLUSTRATIONS _by_ E.
Page 4
were immediately set to work to cut down trees" 278 "We now appeared very wide, and so far from each other in our opinions as to discourage all hope of agreement" 318 "You will find it stream out plentifully from the key on the approach of your knuckle" 328 Father Abraham in his study 330 The end papers show, at the front, the Franklin arms and the Franklin seal; at the back, the medal given by the Boston public schools from the fund left by Franklin for that purpose as provided in the following extract from his will: "I was born in Boston,.
Page 20
inscription: Josiah Franklin, and Abiah his wife, lie here interred.
Page 36
then said he would employ me soon, though he had just then nothing for me to do; and, taking old Bradford, whom he had never seen before, to be one of the town's people that had a good will for him, enter'd into a conversation on his present undertaking and prospects; while Bradford, not discovering that he was the other printer's father, on Keimer's saying he expected soon to get the greatest part of the business into his own hands, drew him on by artful questions, and starting little doubts, to explain all his views, what interest he reli'd on, and in what manner he intended to proceed.
Page 38
I took leave of Keimer as going to see my friends.
Page 50
" So, putting the letter into my hand, he turn'd on his heel and left me to serve some customer.
Page 60
I suffered a good deal, gave up the point in my own mind, and was rather disappointed when I found myself recovering, regretting, in some degree, that I must now, some time or other, have all that disagreeable work to do over again.
Page 62
He was lively, witty, good-natur'd, and a pleasant companion, but idle, thoughtless, and imprudent to the last degree.
Page 71
We gave bail, but saw that, if the money could not be rais'd in time, the suit must soon come to a judgment and execution, and our hopeful prospects must, with us, be ruined, as the press and letters must be sold for payment, perhaps at half price.
Page 82
3.
Page 84
I made a little book, in which I allotted a page for each of the virtues.
Page 93
When another asserted something that I thought an error, I deny'd myself the pleasure of contradicting him abruptly, and of showing immediately some absurdity in his proposition; and in answering I began by observing that in certain cases or circumstances his opinion would be right, but in the present case there _appear'd_ or _seem'd_ to me some difference, etc.
Page 98
10 17 4 35 8 Sun ent.
Page 107
[Illustration: "Our former differences were forgotten, and our meeting was very cordial and affectionate"] In 1736 I lost one of my sons, a fine boy of four years old, by the small-pox, taken in the common way.
Page 110
The multitudes of all sects and denominations that attended his sermons were enormous, and it was matter of speculation to me, who was one of the number, to observe the extraordinary influence.
Page 139
I stayed with him several days, din'd with him daily, and had full opportunity of removing all his prejudices, by the information of what the Assembly had before his arrival actually done, and were still willing to do, to facilitate his operations.
Page 153
Being returned to Philadelphia, I found the association went on swimmingly, the inhabitants that were not Quakers having pretty generally come into it, formed themselves into companies, and chose their captains, lieutenants, and ensigns, according to the new law.
Page 169
was against an immediate complaint to government, and thought the proprietaries should first be personally appli'd to, who might possibly be induc'd by the interposition and persuasion of some private friends, to accommodate matters amicably.
Page 181
1774? _A Parable on Brotherly Love.
Page 188
].