302 Torpedo 'Experiments^ April, 1775 



so that there seems no reason to think that the resistance of water about the 

 saltness of sea water varies in a quicker ratio than that of the quantity of salt 

 in it. 



Without torpedo jar 1 + 2 + 4 was ver y sensible in elbows, but 1 + 2 was 

 felt only in wrists. 



597] Let a given charge be passed by double circuit through your body and 

 another circuit; let the quantity of electricity which passes along the second 

 circuit be to that which passes through your body as * to i ; the rapidity with 

 which the fluid passes through your body is the same whatever is the value 

 of x, and the quantity which passes through your body is * as i + x. 



If the resistance which the electricity meets with before it comes to the 

 double circuit is to that which it would meet with in passing through your 

 body alone as a to i, the force required to drive electricity through the whole 



circuit in given time is as a + - - , and therefore the time in which it is 



i + x 



I T. I V 



discharged = = , and the velocity with which it passes 



i i + a + ax 

 a + - 



i + x 



through your body is as , and the strength of shock is as 



i + a + ax 



(i + x} (i + a + ax) ' 



In trying resistance of liquors by double circuit, if the quantity of elec- 

 tricity which passes through the liquor is to that which passes through your 

 body as x to [i], the quantity of electricity which passes through your body 



is as - , and the rapidity with which it passes through your body is given. 



I ~T~ X 



In trying it with single circuit, if resistance el. in passing through liquor 

 is to that in passing through your body as x to i, velocity of electricity is as 



- , and the quantity is given, therefore in both ways of trying it, the 



I ~T~ X 



greater x is, the more exact will be the method, and both methods will be equally 

 exact if x is given or very great, supposing the strength of the shock to be as 

 the quantity of electricity into its velocity f. 



(16 



598] Shock produced by charge -i 22 in water bears the proper proportion 



(44 



f 6 

 to that caused by charge j 8 out of water. 



Ii6 



* [Should be inversely as i + x. The rest is a correct statement of the strength 

 of derived currents according to the law afterwards published by Ohm. See Art. 



4I7-] 



f [The "velocity" is what is now called the strength of the current. The 

 strength of the shock is assumed to be proportional to the energy of the discharge. 

 See Arts. 406, 573, 610, and Note 31.] 



