. L'électricité pratique en médecine et chirurgie. ly. Cette positiveelectrification, ou la charge, autour de la plaque, en ap-proaching le peigne métallique induit sur elle un pied d'negativecharge, alors que la charge positive passe vers le pôle Dh inmetallic rapport avec le peigne. Comme la partie chargée de l'approche plus près de la plaque encore ofpotential peigne la différence au dernier devient si grande que le peigne se décharge. MACHINES DE FROTTEMENT. 2o elle-même contre la plaque, annulant ainsi la charge de la dernière,qui passe de nouveau sous l'amalgame dans un état neutre.La décharge sur

• Contributeur: The Reading Room / Alamy Banque D'Images
• ID de l’image: 2AFP92X
• Taille du fichier: 7,1 MB (326 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1863 x 1341 px | 31,5 x 22,7 cm | 12,4 x 8,9 inches | 150dpi

Informations supplémentaires

Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

. Practical electricity in medicine and surgery. ly. This positiveelectrification, or charge, carried around with the plate, in ap-proaching the metal comb induces upon it an equal negativecharge, while the positive charge passes toward the pole Dh inmetallic connection with the comb. As the charged portion ofthe plate approaches still nearer the comb the difference ofpotential at last becomes so great that the comb discharges. FRICTIONAL MACHINES. 2o itself against the plate, thus annulling the charge on the latter, which passes again under the amalgam in a neutral condition.The discharge upon the disk is facilitated by the points of thecomb, which are employed for that purpose.* In reality, all of the half surface of the plate acts induct-ively, but with varying intensity, upon the comb at any onetime; but we have considered only a small part of the disk forthe sake of simplicity. It may be added that the discharge between the comb andthe disk takes place in what is known as the brush discharge, which is a species of electric spray.. Fig. 22.—Induction or Holtz Machine. The rubber, which, on account of the amalgam, is a goodconductor, transmits its negative charge to the pole D2 and thetwo poles having thus their charges continually augmentedacquire finally such a difference of potential that a spark passesbetween them. The length of spark which can be obtained * When the difference of potential or electro-motive force between two bodies becomes veryhigh the electricity flows from one to the other through the insulating medium in the form of aspark. Different media resist such discharges in different degrees, but any medium can beruptured by a sufficiently high electro-motive force. The insulating power of air is compara-tively great, but it can resist what maybe called electric pressure only within certain limits, after which it gives way, and the electric spark passes, accompanied by noise and light. If thepressure is not so great as to produce sparks, and the el

Recherche dans la banque de photos par tags

• bookcentury1800
• bookdecade1890
• bookyear1890
• livresubjectelectri