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PAGE OF MS.
ARTICLES
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
76. Second thermometer tube; also comparison of charge of
cylinder used in p. 69 with D+E
542
543
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
544
545
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 .
79. Charge of plate of experimental rosin designed for com-
paring plate of glass and rosin, tried both when warm and
when cold
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
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
85. Circle of 181" compared with double plates; also plate D,
plate air, and the two double plates compared with circles
of 36" and 30"
550
551
552
553
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.
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
95. Excess of redundant fluid on the positive side above the
deficiency on the negative side in glass plate and plate air,
and compound plate of p. 83, compared with charge of
simple plate.
99. Whether parellelepiped box included in a hollow box of the
same shape is overcharged on electrifying the outer box
100. Globe within hollow globe tried again
560
561
562
105. Whether the force with which two bodies repel is as the
square of the redundant fluid, tried by straw electrometers 563-7
113. Separation of Henly's electrometer by different strengths of electrification.
115. Separation of Henly's electrometer when fixed in the usual way and on upright rod
116. Result of the comparison of different electrometers in p. 70,
75, and 95
118. Comparison of Lane's electrometer with light straw electro-
meter in different weather
122.
121. Comparison of strength of shocks by points and blunt bodies
Whether shock of one jar is greater or less than that of
twice that quantity of fluid spread on four jars
123. Comparison of the diminution which the shock receives by
passing through water in tubes of different bores, and
whether it is as much diminished in passing through nine
small tubes as through the same length of one large tube,
the area of whose bore is equal to that of the nine small ones
125. Comparison of the diminution of the shock by passing
through iron wire or through salt water
568
569
570
571
572
573
574
575
126. Measures of glass tubes used in p. 123 and 124 more accu-
rate, with the computations of those pages over again
127. Comparison of conducting powers of sat. sol. S. S.1 and rain
water.
128. Whether the electricity is resisted in passing out of one
medium into another in perfect contact with it
129-131. Comparison made at Nairne's of his Henly on conductor, and on upright rod
Comparison of charges of jars and battery, method of repeated communi-
Charge of 1st battery of Nairne
Whether shock is diminished by imperfect conduction of the salt water
in the jars
Specific gravity of solutions of salt
Rule for finding the quantity of salt in water from its specific gravity
Measurement of Lane's second and third electrometer
Conductivity of salted wood
Dimensions of coatings of glass plates
Rules for making trial plates
Specifications for coating of plates.
Measures of thickness of 2nd rosin plate
Measures of thickness of crown glass
584
585
586
587
588
589
590
591
592
Mr Ronayne, Mr Hunter, Dr Priestley, Mr Lane, Mr N[airne ?].
Tuesday, May 30 [1775]. Distance of discharge of Lane the same for
great or small number of jars.
604
Charge required to force electricity through chain.
605
Wednesday, May 31 [1775]. Comparison of rows of battery
Monday, June 12 [1775]. Relation between quantity of electricity and
number of jars that the intensity of the shock may be the same
610
Second leather Torpedo under water
611
Tuesday, July 4 [1775]. Second leather Torpedo touched in various
RESISTANCE TO ELECTRICITY.
From MS. No. 20.
Comparison of conducting power of salt and fresh water, in the latter end
of March and beginning of April, 1776.
Method of experiment
The experiments
Six jars compared with one row. Experiments
Examination whether salt in 69 conducts better when warm or when
cold.
Examination whether the proportion which conducting power of sat. sol.
and salt in 999 bear to each other is altered by heat.
Comparison of water purged of air and plain water
Comparison of water impregnated with fixed air and plain water.
616
617
618
619
620
621
622
623
624
625
To find what power of the velocity the resistance is proportional to
Salt solutions
Copper wire stretched by silk; sensation, sound and light of shock
636
637
638
639
640
641
642
643
644
645
646
Whether charge of coated glass bears the same proportion to that of an
other body whether electricity is strong or weak
Correction for spreading with electricity strong and weak.
661
662, 663
664
665