Contents xxi 



PAGE 

 OF MS. ARTICLES 



36. Lac and 4th rosin with D + E + F, also thin wax with D t E, also thick wax, 2nd 



rosin and first made rosin and plate air 5 with F 519 



38. Breaking of electricity through thin plates of lac, experimental rosin, and 

 dephlegmated bees wax . . . . . . . . . . .520 



39. The quantity of electricity in a Florence flask tried with and without a magazine 521 



41. Computed power of above flask 522 



42. As it appeared by the foregoing experiment that the Florence flask contained 

 more electricity when it continued charged a good while than when charged and 

 discharged immediately, it was tried whether the case was the same with the 

 coated globes ............. 523 



43. Diminution of shock by passing through different liquors ..... 524 

 47. Whether force with which bodies repel is as square of redundant fluid tried by 



pith balls hung by threads .......... 525 



5 1 . Whether the charge of plate E bears the same proportion to that of another body, 



whether the electrification is strong or weak, tried by machine for Leyden vials 526 



53. Plain wax and 3rd dephlegmated wax with E + F, and 5th rosin with double 

 plate A and B. Also small ground crown with D +E + F, and large do. with C 527 



54. K, L and M, compared with D + E + F at distance and close together ; also large 

 ground crown with C and small one with D + E + F; also 3rd dephlegmated wax 



and plain wax with E + F; also 5th rosin with double B . . . . . 528 



55. K + L + M compared with A, B and C ; also A + B + C with H .... 529 



56. K +L + M compared with B, with electrification of different strengths . . 530 



57. K + L + M with A, B and C ; also D + E + F with K, L and M ; also small ground 

 crown with K, L and M, and D + E + F, and large ground crown with A, B and 



C, andK + L + M 531 



58. On the light visible round the edges of coated plates on charging them . . 532 



59. Crown A and C and large ground crown with C ; also 3rd dephlegmated wax, 

 plain wax and sliding plate 3 with E + F; also 2 double plates with E, F and D 533 



60. Charge of the triple plate, the three plates A, B and C placed over each other 



with bits of lead between coatings 534 



61. Whether the charge of plate D bears the same proportion to that of another body 

 whether the charge is strong or weak, tried with machine for Leyden vials . 535 



62. H with slits and a crown glass with oblong coating, compared with white cylinder, 



also A and C with slits compared with B . . . . . . . . 536 



65. Crown with slits and H with do. compared with white cylinder, and A and C 



with oblongs compared with B .......... 537 



67. Experiment of p. 61, tried with small ball blown to the end of a thermometer 



tube ; also fringed rings on plate of crown glass, &c. . . . . . . 538 



69. Whether charge of Leyden vial bears the same proportion to that of another body 

 when the electrification is very weak as when it is strong ; tried by communicating 



the electricity of small pieces of wire to tin cylinder and to D and E . . . 539 



70. Lane's electrometer compared with straw and paper electrometers . . . 540 



71. Crown and H with slits compared with white cylinder; also on the excitation 



of electricity by separating a brass plate from a glass one 541 



73. Whether the middle of three parallel plates communicating together is much 

 overcharged on electrifying the plates ........ 542 



74. Charge of A, B and C laid on each other without any coatings between ; also 

 charge of ist thermometer tube 543 



75. Lane's electrometer compared with straw and paper electrometers ; also charge of 

 plate rosin with brass coating made to prevent spreading of electricity . . 544 



76. Second thermometer tube ; also comparison of charge of cylinder used in p. 69 



with D + E 545 



77. Charge of second thermometer tube; also that of rosin plate with brass coating; 



also that of A, B and C laid on each other without coatings between . . . 546 



78. Quantity of electricity in plate D compared with that of tin circle of 36" and 



one of 30", by machine for trying simple plates ...... 547 



79. Charge of plate of experimental rosin designed for compound plate of glass and 

 rosin, tried both when warm and when cold ....... 548 



