288 'Journal of Experiments, Nov. 1773 



conductor, and a small jar with a Lane's electrometer fastened to it was made 

 to touch the short one. When Henly's stood at 



3 Lane's dis- <7 + 35 = "668 



55 charged at '7 + 5 = -678 inch. 



70 19 + 30 = -741 



The jar was then changed for one of rather more coated surface and a much 

 smaller knob. When Henly's stood at 30 or 35, Lane's discharged at 17-7 = -650, 

 so that Lane's discharged at nearly the same distance with the same charge, 

 whichever jar was used. 



Henly's electrometer was then placed on an upright rod, touching the long 

 conductor near the furthest end, Lane's electrometer with the first jar being 

 placed as before. 



Henly then rose to 55 or 60 before Lane discharged at 17-55 = -681 inch. 

 Henly being then lifted higher it rose to 65, Lane remaining as before. It was 

 then lifted still higher, when it rose to 



6s I7'55 = '631 



before Lane s 



discharged at 

 35 or 40 6-55 = -263 



Lane's being then separated to 27-55 = 1-060, the jar once discharged over 

 surface of glass and once to the electrometer, but there seemed reason to think 

 that Henly's rose no higher than before, namely 65. 



My Henly's electrometer usually rose to 90 when Lane's discharged at 

 12-20 = -467 inches. 



Therefore the distance at which Lane's discharges, answering to different 

 numbers on Henly's, is as follows : 



I [Lane] 

 Henly on highest rod 65 1-060 



65 

 50 



35 or 40 

 Henly on conductor .70 



55 

 30 



68 1 



377 

 263 



741 

 678 

 668 

 469 



My Henly on conductor 90 



The distance at which Lane's discharges with a given jar is nearly propor- 

 tional to the quantity of electricity in the jar, for if a jar is charged to a degree 

 at which Lane is found to discharge at a given distance, and its electricity is 

 communicated to another jar of the same size, so as to contain only J as much 

 electricity as before, Lane will then discharge at nearly \ the former distance. 



