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

By Benjamin Franklin

Page 120

ne pouvoit venir que de ce que les pointes des fils de fer
étoient trop éloignées l'une de l'autre, je les ai enfoncées davantage,
& l'expérience a réussi. Quelque préparé que l'on soit au bruit que doit
produire cette inflammation, on en est toujours surpris, mais ce n'est
pas ce qu'il y a à craindre dans cette expérience.»

«L'on doit y prendre des précautions contre deux accidens qui peuvent en
résulter, l'un de tourner le petard du côté opposé aux spectateurs, afin
qu'en sautant il ne puisse blesser personne; l'autre de ne pas tenir à
la main les fils de fer dont les pointes sont enfoncées dans le petard,
parce que si la poudre ne s'enflammoit pas, celui qui les tiendroit
recevroit une commotion peut-être trop forte.»

Je ne me souviens pas si je vous ai écrit que j'ai fondu des épingles de
cuivre & des aiguilles d'acier, changé les pôles d'une aiguille
aimantée, donné le magnétisme & la pôlarité à des aiguilles qui n'en
avoient point, & que j'ai enflammé de la poudre à tirer séche avec
l'étincelle électrique. J'ai cinq bouteilles qui contiennent chacune 8.
ou 9. _galons_; deux de ces bouteilles chargées suffisent pour ces
opérations; mais je puis les charger & les décharger toutes ensemble, il
n'y a point d'autres bornes dans la force que l'homme peut donner &
employer dans la matière électrique, que celles qui viennent de la
dépense & du travail; car on peut augmenter le nombre des bouteilles à
l'infini, les unir & les décharger toutes ensemble, comme s'il n'y en
avoit qu'une. La force & l'effet sera proportionnée à leur nombre & à
leur situation. Les plus grands effets connus des coups de foudre
ordinaires peuvent, je pense, sans beaucoup de difficulté, être
surpassés par cette voye, ce que l'on n'auroit jamais cru il y a
quelques années. Bien des gens même aujourd'hui pourroient regarder
cette supposition comme un peu extravagante. Ainsi nous sommes plus
avancés en science que les diables de Rabelais à l'âge de deux ans; il
dit d'eux plaisamment qu'ils ne sçavoient qu'un peut tonner & foudroyer
autour de la tête d'un choux.

Je suis avec un sincère respect, votre très-humble & très-obligé
serviteur, B. Franklin.




_LETTRE
De M. E. KINNERSLEY,
à Boston,

à B. Franklin, Écuyer à Philadelphie, le 3. Février 1752._


MONSIEUR,

J'ai à vous communiquer les expériences suivantes. Je tenois dans une
main un fil-d'archal qui étoit attaché par l'autre bout à la manivelle
d'une Pompe, pour essayer si le coup du premier conducteur au travers de
mes bras, seroit un peu plus fort que lorsqu'il passoit seulement sur la
surface de la terre; mais je n'y

Last Page Next Page

Text Comparison with The Complete Works in Philosophy, Politics and Morals of the late Dr. Benjamin Franklin, Vol. 2 [of 3]

Page 80
--Effect of the Sun's Rays on Cloths of different Colours.
Page 82
When the communication between the two kinds of water is open, this supposed wall of separation may be conceived as a moveable one, which is not only pushed some miles higher up the river by every flood tide from the sea, and carried down again as far by every tide of ebb, but which has even this space of vibration removed nearer to the sea in wet seasons, when the springs and brooks in the upper country are augmented by the falling rains, so as to swell the river, and farther from the sea in dry seasons.
Page 91
Such an operation as this possibly occasioned much of Europe, and among the rest this Mountain of Passy on which I live, and which is composed of limestone, rock and sea-shells, to be abandoned by the sea, and to change its ancient climate, which seems to have been a hot one.
Page 95
_ [No date.
Page 109
Being puzzled with the differing appearance, I at last pointed it out to our captain, and asked him the meaning of it.
Page 136
This sail is to be extended on the cross of figure 16, the top and bottom points well secured to the ends of the long spar; the two side points d, e, fastened to the ends of two cords, which coming from the angle of the loop (which must be similar to the loop of a kite) pass through two rings at the ends of the short spar, so as that on pulling upon the loop the sail will be drawn to its extent.
Page 142
When you intend a long voyage, you may do well to keep your intention as much as possible a secret, or at least the time of your departure; otherwise you will be continually interrupted in your preparations by the visits of friends and acquaintance, who will not only rob you of the time you want, but put things out of your mind, so that when you come to sea, you have the mortification to recollect points of business that ought to have been done, accounts you intended to settle, and conveniencies you had proposed to bring with you, &c.
Page 147
If then he is bound to the westward, he should cross the stream to get out of it as soon as possible.
Page 161
} | | | 31 | | | 60| 58 | 62| 62 | | | | | | |Aug | | | | | | | | | | | | | 1 |49 15 | 4 15| 63| 62 | 60| 64 |East |SW ½W | 60 |22° 0 | | | 2 |48 28 | 8 58| 64| 64 | 64| 63 |E S E|WbS ½S| 174 | | | | 3 |47 0 |12 13| 60| 67 | omitted |N E |SW bW | 160 | | | | 4 |45 0 |15 43| 66| 66 |do.
Page 225
First, when the fire burns briskly in cold weather, the howling or whistling noise made by the wind, as it enters the room through the crevices, when the chimney is open as usual, ceases as soon as the plate is slid in to its proper distance.
Page 229
In some houses of the lower people among the northern nations of Europe, and among the poorer sort of Germans in Pensylvania, I have observed this construction, which appears very advantageous.
Page 237
0 9½ Length of the front plate E, where longest, 0 11 The cover D, square, 0 12 Hole in ditto, diameter, 0 3 Sliding plates Y Y, their length, each, 1 0 ----- ----- ----- their breadth, each, 0 4½ Drawer G, its length, 1 0 ----- ----- breadth, 0 5¾ ----- ----- depth, 0 4 ----- ----- depth of its further end, only, 0 1 Grate H in the vase, its diameter to the extremity of its knobs, 0 5¾ Thickness of the bars at top, 0 0¼ ----- ----- ----- at bottom, less, 0 .
Page 277
| | *Ô» |(sh) Ship, wish.
Page 288
Smith's hands, for the purpose of being digested, and in due time published among the transactions of that body.
Page 297
6.
Page 299
Was the face of the earth vacant of other plants, it might be gradually sowed and the overspread with one kind only, as for instance, with fennel; and were it empty of other inhabitants, it might, in a few ages, be replenished from one nation only, as for instance, with Englishmen.
Page 308
We may therefore hope, in this undertaking, to be of, some service to our country, as well as to those poor people, who, however distant from us, are in truth related to us, and whose interests do, in some degree, concern.
Page 316
This policy, those, whom we are pleased to call Barbarians, have in a great measure adopted; for the trading subjects of any power with whom the emperor of Morocco may be at war, are not liable to capture, when within sight of his land, going.
Page 331
_ "I am very sensible, &c.
Page 391
_Wedderburn_, Mr.