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

By Benjamin Franklin

Page 244

arm upwards into the air, with a needle between his
fingers, on the point of which light may be seen in the night, is,
indeed, a curious one. In this town the air is generally moister than
with us, and here I have seen Mr. Canton electrify the air in one
room positively, and in another, which communicated by a door, he has
electrised the air negatively. The difference was easily discovered
by his cork balls, as he passed out of one room into another.--Pere
Beccaria, too, has a pretty experiment, which shows that air may
be electrised. Suspending a pair of small light balls, by flaxen
threads, to the end of his prime conductor, he turns his globe some
time, electrising positively, the balls diverging and continuing
separate all the time. Then he presents the point of a needle to
his conductor, which gradually drawing off the electric fluid, the
balls approach each other, and touch, before all is drawn from the
conductor; opening again as more is drawn off, and separating nearly
as wide as at first, when the conductor is reduced to the natural
state. By this it appears, that when the balls came together, the air
surrounding the balls was just as much electrised as the conductor
at that time; and more than the conductor, when that was reduced to
its natural state. For the balls, though in the natural state, will
diverge, when the air that surrounds them is electrised _plus_ or
_minus_, as well as when that is in its natural state and they are
electrised _plus_ or _minus_ themselves. I foresee that you will
apply this experiment to the support of your hypothesis, and I think
you may make a good deal of it.

It was a curious enquiry of yours, Whether the electricity of the
air, in clear dry weather, be of the same density at the height of
two or three hundred yards, as near the surface of the earth; and
I am glad you made the experiment. Upon reflection, it should seem
probable, that whether the general state of the atmosphere at any
time be positive or negative, that part of it which is next the earth
will be nearer the natural state, by having given to the earth in one
case, or having received from it in the other. In electrising the
air of a room, that which is nearest the walls, or floor, is least
altered. There is only one small ambiguity in the experiment, which
may be cleared by more trials; it arises from the supposition that
bodies may be electrised positively by

Last Page Next Page

Text Comparison with Vie de Franklin, écrite par lui-même - Tome I Suivie de ses œuvres morales, politiques et littéraires

Page 9
Son petit-fils, Samuel Franklin, vit maintenant à Boston.
Page 19
En suivant une méthode orgueilleuse, vous pouvez rarement espérer de plaire à vos auditeurs, de vous concilier leur bienveillance, et de convaincre ceux que vous cherchez à faire entrer dans vos vues.
Page 25
Je lui demandai conseil.
Page 31
J'avois été absent sept mois entiers, pendant lesquels mes parens n'avoient reçu aucune nouvelle de moi; car le capitaine Holmes, mon beau-frère, n'étoit point encore de retour, et n'avoit rien dit de moi dans ses lettres.
Page 41
Inconnus l'un et l'autre à toutes les personnes du vaisseau, nous étions regardés comme des gens du commun.
Page 67
Sur ces entrefaites, j'ouvris une petite boutique de marchand de papier.
Page 71
Après avoir passé par les différentes classes du collége, en beaucoup moins de temps qu'on a coutume de le faire, il en sortit, n'étant encore âgé que de seize ans.
Page 72
fut le premier qui le proposa, vers l'année 1731.
Page 78
Il y avoit une petite clef attachée à l'endroit où la corde de chanvre se terminoit.
Page 109
.
Page 114
Cependant, j'espère que si les.
Page 117
Je ne ferai que peu d'usage du privilège qu'ont les vieillards, de donner des avis à leurs jeunes amis.
Page 119
RÉVÉREND DOCTEUR, J'ai reçu votre lettre amicale, et votre excellent avis aux habitans des États-Unis.
Page 122
PÉTITION DE LA MAIN GAUCHE, À CEUX QUI SONT CHARGÉS D'ÉLEVER DES ENFANS.
Page 127
Lib.
Page 133
[66] La matière transpirable est cette vapeur qui se détache de notre corps, par les pores et par les poumons.
Page 135
ÉCRITS EN L'ANNÉE 1748.
Page 138
--Celui qui achète à crédit, paie sa part de cette augmentation.
Page 139
Aucun de ceux qui étoient présens ne put nous satisfaire sur ce point; mais tous convinrent qu'il méritoit d'être connu, et qu'il étoit à désirer qu'on pût rendre moins cher le moyen d'éclairer les appartemens, puisque tous les autres.
Page 144
et écrit à sa sollicitation.