![On Animal Electricity, an Abstract [By J. Muller] of the Discoveries of E. Du Bois-Reymond, Ed. By H.B. Jones](/jacket/500x500/9781230269153.jpg)
Publisher's Synopsis
Ce livre historique peut contenir de nombreuses coquilles et du texte manquant. Les acheteurs peuvent generalement telecharger une copie gratuite scannee du livre original (sans les coquilles) aupres de l'editeur. Non reference. Non illustre. 1852 edition. Extrait: ...be positive or negative is indicated by + and--. By means of this figure, the effects of placing a conductor on any part of the surrounding fluid will at once be seen. If the conductor be placed as at R, so that its ends a and b are equidistant from the middle of the side with which it is in contact, no current will ensue, because there is the same negative electric tension at a and at b. If the conductor be moved from the middle, as at R', the tension of the electricity at each of its ends will no longer be equal. It is true that the electricity at d and c is the same in kind, being positive; but as there is more tension at d, a current will pass from d to c. This current of course becomes stronger when one end of the conductor is placed on the copper and the other on the zinc, as in R," for/touches a point where the electrical tension is positive, g one where it is negative. Du Bois-Reymond tried to establish these deductions experimentally. After various forms of experiment, he arrived at this, which faithfully represents the phenomena of the muscular current. A cylinder of copper, 61 inches high and 2-l inches in diameter, was covered with zinc on its cylindrical surface, while its base was left bare. The zinc was amalgamated on its surface. The cylinder hung from a well varnished hook, by a string, into a cylindrical glass vessel 3-5 inches in diameter, which contained water. (Fig. 30.) The stand which held up the cylinder carried a clamp in which there was a cork with two holes. In either hole there was a glass tube, in which was a copper wire covered with silk; the copper wire was hermetically sealed into the lower end of the tube. The tubes could be pushed up and down in each of..."
