Capacities of similar bodies 



Plate vertical 



Fore obs. at extremity 



do. wire 9 inches over 



Bent wire 



Cross wire 



Back observation 



471] Wednesday, Dec. 18 [1771]. Th. 50. S. H. 17^ C. H. + 3. 

 Trials of flat plates of different substances about i foot square*. 



227 



Tm plate 



Slate 

 Portland stone 



Bremen stone 



Glass coated 

 with tinfoil 



Pasteboard 



Glass coated with 

 salt and gum-water 

 Do. with charcoal 

 powder 



C 2 sep. about T V in. 



_ g do - 



- 5 f 



- 2j do. 



Side of 

 equiv. square diff. 



3 '73 



\ sum 

 "'95 



I 4' 6 } 

 10-35 / 



371 12-20 



g_ 



J 



~ ' 



i? 

 -5 



Z 5j 



fC 2 

 JB - 5 



fB - 5 



\C - 2 



fC - 2\ 



\B-5i 



same as first tried 



Th. 50. S. H. 17. 



The subject is continued in Art. 480. 



3-86 11-89 



C. H. 



472] Comparison of two tin circles 9-3 inches in diameter with one of 18-5 ; 

 the two circles being placed in vertical planes parallel to each other and per- 

 pendicular to the vertical plane joining their centers and the trial plate, their 

 centers being both in the above-mentioned plane f. 



There was a distinct touching wire to each plate meeting each other at R, 

 the two wires were kept asunder by a slender glass tube, and about i inch of 

 the end of the wires bent at right angles horizontally in order to touch the 

 plates by being let fall on their edges. When the large circle was tried, this 



[Exp. iv, Art. 269.] 



f [Exp. v, Art. 273.] 



152 



