308 Torpedo Experiments, June, 1775 



The shock of the Torp. was received touching pos. el. part with metal and 

 neg. with one of these bits, the end which touched the torp. and that part 

 which I held in hand being bound round with tinfoil. 



With 6 rows elect, to ij, I felt slight shock through wainscot: dist. tinfoils 

 2 inc. 



With D charge through deal, tinfoils at i inc., none. 



With 3 rows to ij; received shock through beech, tinfoils at 4f inc. dist., 

 about as strong as with ij rows when touched with metals on both sides. 



With D charge through 4^ inches of dry deal dipt in salt water and tried 

 the instant it was taken out, none. 



Taking hold of tail in one hand & touching pos. side with metal, brisk 

 shock. When touching neg. side with metal much slighter, the exper. tried 

 with each pos. and each neg. part. 



Mon. June 12 [1775]. 



610] Jar i elect, to 2j by pith el. seemed to give shock of same strength 

 as B + 2A comm. to whole battery; it was weaker than 2B and stronger than 

 B commun. to D, but as there is a good deal of difference between the sensa- 

 tions of the 2, it is not easy comparing them. 



According to this exp. the numb, jars which el. should be divided amongst 

 in order to produce given shock should be as the 2| power of quant, el., and 

 therefore el. 2 jars should be comm. to 5^ more in order to produce same shock 

 as i jar*. 



Mon. June 18 [1776 f]. 



iR + 36 + C + 2 A comm. to 7 rows = (34^), & el. to a given mark on 

 pith el. gives shock equal or rather greater than i row el. to same degree and 

 not commun. to rest. 



iR + 36 + C + 2 A elect, to i J on straw el. and comm. to rest always passed 

 through i loop of machine. The same elect, to i sometimes passed, sometimes 

 failed. 



i row charged to i and not commun. to any more passed 3 times through 

 5 loops without once failing. 



iR + 36 + C + 2A el. to i and comm. to rest would never pass through 

 2 loops. 



611] 2 nd Leather torpedo tried under water with metals with glass tubes 

 on them, all rows charged to 4 gave briskish shock, which was much greater 

 than shock out of water with i row to i \, but rather less than with 2 rows to D. 



The shock received in same manner with i row not communicated to rest 

 was less when el. to ij, and about equal when el. to 2j. 



* [Arts. 406, 573, and Note 31.] f [Probably June 19, 1775.] 



