

Shock through various substances 309 



With 7 rows el. to i shock of D Torp. when received through the salted 

 lime tree wood gave slight shock about equal to 3A passed through same wood 

 without torpedo. 



Charge of 7 rows el. to 4 is to that of if row el. to ij as - = : i : : 12 to i. 



3 



612] Tu. July 4 [1775]. 2 nd leather torp., the wire belonging to convex 

 side fastened to outside of battery and inside of battery touched by wire of 

 flat side. 



3 rows of battery charged to i\ and comm. to remainder. Under water no 

 sensible diff. whether I touched convex or flat side with one hand. 



Out of water, touching tail with one hand and one side of one elect, organ 

 with metal, a much greater shock if I touched convex side than flat side. The 

 event was the same if it was elect, by neg. elect. 



Touching convex side of both organs with one hand, only standing on 

 electrical stool, a shock in that hand, but I think scarcely so strong as under 

 water. 



Touching flat side in same way, much the same. 



Laying i finger on convex surface of one organ & another finger of same 

 hand on the middle of the convex surface, a very slight shock. 



Laying one finger on convex surface of one organ & the other on the nearest 

 edge of the torpedo, a considerably greater shock, but not strong. 



Laying one finger on convex and another on flat side of same organ, a con- 

 siderably greater shock, but do not know how to compare it in point of strength 

 with that taken the usual way. 



Tried without any torpedo *. 



613] 36 being comm. to 7 rows and passed through i loop of 26 links of 

 small chain. If the chain was not stretched by any additional weight, the 

 shock did not pass. If the middle link was stretched by a weight of 7 pwt. it 

 passed, & the light was visible in a few links. If it was stretched by a weight 

 of 13^ pwt. no light was seen. There was no remarkable difference in the strength 

 of the shock, whether it was received through chain tended by 13^ pw. or without 

 chain. 



The chain was fastened to the same machine that was used in a former 

 experiment, it was 7-9 inc. long and the distance of the supports 5-1. 



The room was quite dark, it being tried at night without any candle in the 

 room. 



3 rows of battery were elect, till pith el. sep. to i, its el. was then comm. 

 to the rest of the battery, & I received the shock of I row, the elect, having its 

 choice whether it would pass through my body or through some salt water. 



* [Art. 437.] 



