270 



LOCALIZED ELECTRIZATION. 



Fig. 64. 



connected together at one of their extremities by a transverse bar 

 of soft iron. 



It is placed on the flat, and liorizontally upon a support fixed 

 to the posterior part of the case of the apparatus. Its anterior 

 extremity rests on two other supports. 



B. — The armature and its motor system. 



The armature, which by its movement of rotation produces 

 the intermissions of the magnetic current, is traversed in its 

 middle part by a horizontal axis, terminated at its extremities by 

 a very hard steel point, received in steel sockets, which are screwed 

 into two copper mounts. These mounts are firmly fixed to a 

 square movable plate of copper, G, which rests on the base of the 

 apparatus. Between these two mounts, and at their superior 

 extremity, is fitted a large wheel. A, the axis of which traverses on 

 one side the anterior mount in which it rotates, while the other 

 extremity terminates in a point, and is received in a piece fixed to 

 the posterior mount. The handle M, which puts the large wheel 

 in motion, can be removed at pleasure. The circumference of the 

 large wheel A is divided into sixty-four teeth, wliich set in action 

 a small ^Alleel of eight teeth, fixed upon the axis of the arma- 

 ture in such a manner that at every revolution of the great wlieel 

 the armature turns eight times upon its axis, and consequently 

 produces thirty-two intermissions of the current of induction. As 

 it is possible to make the large wheel revolve twice in a seccmd, 

 we may obtain sixty-four intermissions in the same period of time. 



