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Researches in the Theory and Calculus of Operations. 293 



the wires ss f are connected through the battery P, the 

 coil around AA X is charged, the current passing from left 

 to right. The pressure of the force from the core against the 

 extremity a" of the coil, being now unresisted by the force 

 from the wire (which just moves away from it), makes its 

 way into the same current, leaving unbalanced the force at 

 the other extremity a' of the path from the core. As the 

 like happens at the opposite extremity b'b" of the core and 

 coil, regard being had to the opposing qualities of the 

 complementary electricities, we see that the force of the 

 coil is constantly reinforced from the coil, for genesis of 

 force is immanent. 



Let now a second similar but larger cylinder BB 2 , coated 

 with the proper insulated wire, be placed around the cylin- 

 der AA X , and its two extremities connected by conducting 

 wire W with the galvanometer K. The cylinder AA X being 

 first disconnected with the battery P, will be in quiet equi- 

 librium with itself, with the core CC^, with the cylinder 

 BBj, and with the surrounding medium ; and the cylinder 

 BB X will also be in equilibrium with itself and its conduct- 

 ing wire with the. cylinder AA X and its enclosed core 

 CCj, and with the surrounding medium. When the wires 

 ss' are plunged into the battery P, the positive current 

 passes from left to right through a" A b", crosses the die- 

 lectrical medium b" b" f 9 thence from right to left through 

 b ,n B a'", and so around through the conducting wire t't, 

 disturbing the galvanometer in its passage, but finally re- 

 maining stationary in the cylinder BB X so long as the cy- 

 linder AA 1 is connected with the battery P. The cylinders 

 being insulated, BB X cannot discharge itself; and so long 

 as the current circulates in AA X , BB X is held in a state of 

 tension directed upon its extremity a'" by the pressure of 

 the current AA X ; but as soon as this current is stopped by 

 dismissing the wir.es ss' from the battery, the compressed 

 forces of BBj react from left to right through a'" A b'" , 



