264 "Journal of Experiments, 21 Feb. 1773 



Sun. Feb. 21. Th. supposed about 55. N. 2oJ. 



If the bits of sealing wax were of such size that the distances of the outer 

 plates were about j , the middle sized cork balls separated about j | . 



The light paper electrometer was used in this experiment. If the globe 2 

 was electrified in the same degree, and its electricity communicated to 



and the middle tin plate electrified by one of these jars (the 

 (i, 2 & 4 ]ars 



two outer being drawn aside) and the cork balls then drawn up against the 



plate, they separated about 1 1 . 



<.s 



I st (8 



In the nd case the electricity of the globe was diminished < , [times], and 



therefore when the outside plates were at j , the quantity of electricity in 



the middle plate was about < * of what it would have received by the same 



IT 

 degree of electrification if placed by itself. 



543] Charge of A, B, and C laid on each other without any coatings between; 

 also charge of I 8t thermometer tube. 



The coatings were taken from the 3 plates A, B and C of Nairne, and the 

 plates cleaned and placed one on the other without anything between them, 

 and stuck together by dropping some melted wax on the edges. The outside 

 surfaces were then coated with circles 6-6 inc. diam. This is called Triple Plate*. 



A thermometer tube was coated with coatings n inch long, the inside being 

 filled with $, with wire let into one end, and the ends stopped with cement. 

 The tube was 12-7 inc. long; weighed i .. 3 .. o, and the bore held 22.gra. of 

 water, the specific gravity of a piece of the same tube weighed twice over was 



II- 



N.B. The comp. pow. of this tube is about goj. 



This is called Tube i f. 



Mon. Feb. 22 [1773]. Th. 53 J. N. 20 J. [8 observations. Art. 675.] 



544] Lane's electrometer compared with straw and paper electrometers; also 

 charge of plate rosin with brass coating made to prevent spreading of electricity. 



Lane's elect. Revolutions] Divisions] 

 Light paper just sep. when [Lane's] el. at i 13 



Straw at i + 3 o 54 



3+i i 36 



Knobs touched at o 7! 



* [Art. 380.] t [Art. 382.] 



