1tS6 M. Marianini on an analog?^ 



tlicular to its own by another electric current different from 

 itself, I wished to ascertain if the same thing also happened 

 when three electric currents intersected each other at right an- 

 gles. With this view, I took a cube of hollow glass of 3 cent, 

 on a side. I made a hole in the middle of each of its faces. 

 I adapted to one of these holes a brass stopper left moveable, 

 in order to be able to fill the cube with a liquid, and I shut 

 each of the other holes with a small strip of brass fixed with 

 Spanish wax. All these strips of brass, except the little stop- 

 per, were put in contact with as many small plates of lead, by 

 means of several small pieces of brass. Having filled the cube 

 with water, T put one of the strips of lead in communication 

 with the positive pole of a battery d couronne de tasses of five 

 pair, and the strip which went from the opposite face was put in 

 communication with one of the ends of the wire of the galvano- 

 meter, while the other end communicated with the negative pole 

 of the same battery, and the needle deviated fifteen degrees. 

 Having suppressed this circulation, I put in communication 

 with the extreme cups of a Voltaic apparatus of fifty couples, 

 two other strips of lead, which were connected with the oppo- 

 site faces of the cube, care being taken to leave the circuit 

 broken for this purpose ; and the strips connected with the 

 two faces opposite to the cube were plunged into the extreme 

 cups of another apparatus of fifty couples, in which the electric 

 fluid had not been made to circulate. Every thing being pre- 

 pared, I re-established the communication with the wire of the 

 galvanometer in the apparatus of five couples ; at the same time 

 I produced the electric currents in the two other apparatus, 

 and the needle deviated fifteen degrees as before. 



In another experiment, instead of producing the three cur- 

 rents at once, I caused to circulate only that of the apparatus 

 in communication with the wire of the galvanometer. I expect- 

 ed that the magnetic needle would cease to oscillate without 

 breaking the circuit for that purpose; and when it became 

 quiet, (the deviation was five degrees,) I established the electric 

 circuit in the two other batteries ; but the needle, without 

 making the slightest motion, preserved its first position. 



I did not find any difference in the results of other experi- 

 ments, in which I had caused a current of an apparatus of 



