Contents xix 



ARTICLES 



C, D, F close together and far asunder 443 



Three coated plates, 1-8 diam., 'i8 thick ......... 444 



Globe and circle, 19-4 of pasteboard. Sliding plates 



19 x 13 



Circle of 1-8 x -18 20-2 _ 10 

 globe ~ 12-4" 6 



Double plate, 1-75 x -285, tried with small sliding trial plate; 



Double plate 1 1 

 globe ~ 18 



Thick plate, 1-45 x -168 _ 14 



"globe -13 " 6 



Trials of wires. Single wire, 96 x -19. Two wires, 48 x -i at 36 and 18 . . . 447 



Two wires, ! x 24, at 18, 36 ........... 448 



Results of wires ............. 449 



Large circle on waxed glass and on silk ......... 450 



Coated glass compared with non-electric body with strong and weak electricity . . 45 1 



Two tin circles of 9-3, compared with one of 18-5 . 452 



Brass wire, 72 x -19 453 



Results. Best formula for cylinder .......... 454 



Coated trial plate of two plates of glass with rosin between . . . . 455 



Trial plate, Double plate A, Double plate B, Large circle (18-5?), 

 I7i- 18-4. 18-3. 18-5. 



Globe, Globe 



,8-8. circle = '^ 6 



Double plates A and B, and plate air, -39 x7'95 ....... 457 



Real power of plate air = computed x '243 [computed is 8 times too great] . . . 458 



N, O, P,Q 459 



B [2-79], D [2-73], white [2-85]. B, D, N, W tried 460 



A [2-16], ist rosin 2-51, trial plates, Art. 457 461 



Results for D, W, B, P, N, O, Q 462 



Coated plate compared with non-electric body with strong and weak + and - electricity 463 



Rosin, 3'4i x -345, compared with double B, by sliding coated plate .... 464 



Side of square equivalent to trial plates ......... 465 



EXPERIMENTS IN 1772 P. 224 

 From MS. No. 13 



Plan of usual disposition of vials and bodies to be tried ...... 4 



Exp. in 46? 



Do. Dec. 14, 1771 48 



Dec. 16, 1771. Conductivity of stone squares 4^9 



Dec. 17, 1771. Exp. in 47 



Dec. 18. Exp. IV 47' 



Exp. v, circles 9-3 and 18-5 47 2 



Dec. 30. Exp. v, observations 473 



Exp. v, 2nd arrangement 474 



Dec. 31. Observations 475 



Two wires, 36 x -i, and i of 72 x -185, Exp. VI 47^ 



Jan. 3, 1772. Observations ...... 477 



Exp. vn : 

 Large tin circle. Double plate B, Tin cylinder, 35-9, 2-53 \ 



Globe, Tin plate square, 15-5 54'2 '73 i 4?8 

 Double plate A. oblong, 17-9 x 13-4 wire, 72, -i8sJ 



