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Two pairs of large corks made, one four times as heavy as the other. Measurement of capacity of vial by touching eight or nine times with coated plate and wire
ARTICLES
438
439
440
441
442
C, D, F close together and far asunder
Three coated plates, 1·8 diam., 18 thick
Globe and circle, 19.4 of pasteboard. Sliding plates
19 x 13
Double plate, 1.75 × 285, tried with small sliding trial plate;
Trials of wires. Single wire, 96 x 19. Two wires, 48 x 1 at 36 and 18.
Two wires, 1 x 24, at 18, 36
Coated glass compared with non-electric body with strong and weak
electricity
Coated trial plate of two plates of glass with rosin between
Real power of plate air=computed × 243 [computed is 8 times too great]
N, O, P, Q
458
459
Coated plate compared with non-electric body with strong and weak
Rosin, 3.41 x 345, compared with double B, by sliding coated plate
Side of square equivalent to trial plates
463
464
465
Results: comparison with Art. 455
Trial of spreading by machine. (Fig. 20).
Three sliding coated plates with brass sliders. Six trial plates
Feb. 4, 1772, D, E, F, G. Two double plates
E+F+G, with I, K, L, M
Feb. 5, 1772, I+K+L, with A+B+C+H, crown glass trial plates
479
480
487
488
489
490
491
492
The pages refer to the MS., the numbers of the Articles to the present edition.
PAGE OF MS.
INDEX TO ELECTRICAL EXPERIMENTS, 1773.
1-10. Spreading of electricity on the surface of glass
494
11. List of thickness and coatings of some plates, see p. 27
12. Quantity of electricity in thick rosin compared with double
plate B, and in 2nd rosin with D, E and G of Nairne
500
501
13. Q and P compared with M and K of Nairne, also green
cylinder 4, and white cylinder compared with plates of
Nairne by means of sliding trial plates
14. 1st and 2nd green and white cylinder and white jar, com-
pared with H of Nairne in usual manner
15. The same in the same way, except with addition of plate M
on the negative side in some experiments
502
503
504
16. Quantity of electricity in the two coated globes, and in the
two jars used in the machine for trying plain plates
505
.
506
507
17. Quantity of electricity in the 4 jars, and in the 5th and 6th
sliding trial plates
18. Thick rosin compared with double plate A and B, and thick
white and 2nd rosin with D, E, F and G of Nairne.
19. Thick white, 2nd rosin, D and F of Nairne and the two
double plates together, compared together; also thin white
with D and E, and D and F.
20. Whitish plate, P, Q, O, old G and thin rosin compared
with M
21. Crown A and C compared with A, B and C of Nairne
23. Whether the shock from the plate [of] air was diminished
by changing the air between them' by moving them hori-
zontally
25. Whether globe included within hollow globe is overcharged
by electrifying outer globe
26. The same thing tried by a better machine
27. Note to list of plates in p. 11.
28.
1st and 2nd sliding plates compared with double plate B;
also Q, P, O and thin rosin; old G and whitish plate com-
pared with D, E, F and M
30. Whether the charge of plate air is diminished by changing
the air between them by lifting up the upper plate
31. Trials of plate air 1, 2, 3 and 4
35. Lac plate and 4th rosin compared with D+E+F, also thin
wax with E+F, also thick wax and plate air 5 with D
36. Lac and 4th rosin with D+E+F, also thin wax with D + E,
38. Breaking of electricity through thin plates of lac, experi-
mental rosin, and dephlegmated bees wax
also thick wax, 2nd rosin and first made rosin and plate
air 5 with F
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 Flo-
rence flask contained more electricity when it continued
The two flat conductors between which the plate of air lies, or, in modern
language, the electrodes.
CONTENTS.
xvii
43.
47.
charged a good while than when charged and discharged
immediately, it was tried whether the case was the same
with the coated globes
Diminution of shock by passing through different liquors
Whether force with which bodies repel is as square of re-
dundant fluid tried by pith balls hung by threads
523
524
525
51.
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.
55.
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
K+L+M compared with A, B and C ; also A+B+C with H
56. K+L+M compared with B, with electrification of different
strength
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, and
K+L+M
On the light visible round the edges of coated plates on
charging them
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
60. Charge of the triple plate, the three plates A, B and C
placed over each other with bits of lead between coat-
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, com-
pared 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.
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
538
539
70. Lane's electrometer compared with straw and paper electro-
meter.
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
540
541
73. Whether the middle of three parallel plates communicating together is much overcharged on electrifying the plates
74. Charge of A, B and C laid on each other without any
coatings between; also charge of 1st thermometer tube
75. Lane's electrometer compared with straw and paper electro-
meter; also charge of plate rosin with brass coating made
to prevent spreading of electricity
542
543
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
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.
79. Charge of plate of experimental rosin designed for com-
paring plate of glass and rosin, tried both when warm and
when cold
546
547
548
80. Whether charge of glass plate is the same when warm as
549
81. Crown with slit coatings and H with oblong compared
with white cylinder; also second thermometer tube with
D+E+F
550
82. Quantity of electricity in plate D, and rosin with brass
coatings, compared with that of tin circle of 36", and one of
30" by machine for trying simple plates with different de-
grees of electrification
83. Charge of compound plate of glass and rosin
551
552
85. Circle of 18" compared with double plates; also plate D,
plate air, and the two double plates compared with circles
of 36" and 30′′
86, 90 & 91. The same with addit. four small rosin plates
554
87. Whether the four rosin plates contain same quantity of
electricity when close together as when at a distance, tried
by machine for Leyden vials.
555
89. Whether charge of white glass thermometer tube is the
same when hot as when cold
556
92. Allowance for connecting wires in p. 86, &c.
557
93. Whether charge of the four rosin plates is the same when
close together as when at a distance. Also on excitation of
electricity by separating brass plate from glass one.
558
94. Comparison of Henly's, Lane's, and straw electrometer
559