Shock related to character of the discharge 283 



Wed. Aug. 18, 1773. 



Th. 63. N. 19. Bar. 29-64. 



With two more jars communicating with E by wire. 



Knobs of Lane's electrometer touched at 0-29. 



st ( 2 " d i 1 ' 43 



I 3 division; Lane discharged at J2-27. 

 Ct at i 4 th U-ii 



With only one jar; straw at 3 rd division, Lane discharged at 2-27. A slip 

 of tinfoil was then pasted on CD the whole length so as to touch the wire of the 

 jar and the frame of the straw electrometer. The result with only one jar was 

 then as follows. 



S ri ' 2*26 



Straw at ,. division. Lane at 



4 th 3'i 



Th. Sept. 2. Th. 65. N. 19. Bar. 29-865. 



ord I-SSi 



Straw at .. division. Lane at . 



4 th 2-41 



Wed. Sep. 8 th . Th. 62|. N. 19$. C. 18. Bar. 29-235. 



ord 2*22 



Straw at ,. division. Lane at 



4 th 3'i 



In the afternoon. Th. 62. N. 19. C. 17. Bar. supp. 29-37. 



ord 2"^^ 



Straw at ... division. Lane at . 

 4 th 3'0 



Fr. Sept. 17. Th. 58^. N. 28^. C. 29. Bar. 29-61. 



Straw at Lane at 



4 2-59 



572] Comparison of strength of shocks by points and blunt bodies. 



The wooden rod used in P. 118 [Art. 571] was supported on waxed glass 

 with the straw electrometer at the end, and some tinfoil wound round part of 

 the rod. The white glass cylinder was put in contact with it, electrified in such 

 a degree that I felt a slight shock in discharging it with a piece of brass wire 

 with a round knob at the end. If it was then electrified in [the] same degree, 

 and discharged [with] a like brass wire with a needle fastened to the end, I 

 could perceive no shock, and but a very slight sensation, even though the point 

 was approached pretty quick. The distance to which the straw electrometer 

 separated was about 1-8 inches. 



The white cylinder was then changed for one of the large jars, the shock 

 was not very different whether it was discharged by the knob or point unless 

 the point was approached very slow. The distance to which the electrometer 

 separated was about -9 inch. 



The wooden rod was taken away, and the white glass cylinder made to rest 

 on the conductor with Henly's electrometer on it, and electrified till it stood 



