The Electrical Researches of ... Henry Cavendish, F. R. S.: Written Between 1771 and 1781, Ed. from the Original Manuscript ...

Front Cover
University Press, 1879 - 454 pages
 

Contents

Resistance of salt solution at different temperatures
lx
Sat sol in 9939 sat sol 688
lxi
AN ATTEMPT TO EXPLAIN SOME OF THE PRINCIPAL PHENOMENA OF ELECTRICITY
1
4 REPULSION AS SQUARE OF REDUNDANT FLUID
4
Comparison with theory
5
Repulsion of a cone on a particle at the vertex 711
7
The repulsion between two bodies electrified to the same degree ought
11
Force between two bodies over or under charged 1315
13
Quantity of electricity in the two coated globes and in
16
Cor 2
17
Separation of Henlys electrometer by different strengths
19
Equilibrium of electricity in a globe 2027
20
Whether the shock from the plate of air was diminished
23
Two plane parallel plates 2838
28
Whether the charge of plate air is diminished by changing
30
Experiment to test the theory Fig
31
Canals of incompressible fluid 3953
39
Cor 5
41
Diminution of shock by passing through different liquors
43
Whether the charge of plate E bears the same proportion
51
Pressure of electric fluid against a surface
54
Capacity when the density is supposed uniform
61
Charges of similar bodies as the n 1 power of their corresponding diame
67
Result of the comparison of different electrometers in p
70
Charge of a thin flat plate independent of its thickness
73
Fig 6 Two equidistant concave plates
74
Equivalent thickness of plate if there were no penetration
83
Equilibrium of electricity in bodies communicating by a canal is
84
Fig 11 Two coated plates in communication little affected
89
Whether the conditions of equilibrium are the same for two bodies com
94
217
104
Attraction and repulsion 106117
106
The charge of the inner globe is less than
110
Condition of electric equilibrium between conductors in electric com
116
On the cases in which bodies receive electricity from or part with
118
Effects of the electrification of the
125
Cantons and Franklins experiments
127
Intention of the experiments
130
Method of the experiment
131
Cor Distribution probably nearly the same as in plate of air of equiva
137
New apparatus for the comparison of capacities Fig
144
Three coated plates
146
Advantage of the second method
150
Ten plates from Nairne 593
157
Comparison of D + E + F when close together and when six inches apart
158
Comparison of different cylinders
161
On the Leyden vial
168
Green glass cylinders 594
170
386
189
Illustration from the equilibrium of
200
Shocks from 1st Torpedo 596
205
Theory of condensers
206
438
216
452
222
Double plate
223
comparison of a disk with a sphere
237
Exp IV
238
+ and electricity
280
Disturbing canse
287
Comparison of strength of shocks by points and blunt bodies
292
Electric resistance of salt and fresh water and of iron wire
310
First leather Torpedo 599
312
Experiment of p 61 tried with small ball blown to the
316
Experiments without any Torpedo 613
319
Comparison of conducting power of salt and fresh water in the latter
321
Effect of temperature 691
326
RESISTANCE OF COPPER WIRE
338
41 345 compared with double B by sliding coated plate
344
536
349
Table of glass plates 673
355
Comparison with a very weak degree of electrification Large cylinder
358
Fixed air in water 693
360
Experiments in January 1781 695
361
NOTES BY THE EDITOR NOTE PAGE 1 On the theory of the electric fluid
362
Comparison with positive and negative electrification
364
Distribution of hypothetical fluids in spheres c
368
Table of the charges of glass plates
370
Canals of incompressible fluid
375
Charges of two parallel disks close together
378
Infinite body
379
Molecular constitution of air
380
Zero of potential
382
Cases of Attraction and Repulsion
383
Fifth hypothesis on the communication of electricity between conductor
384
Electromotive force required to produce a spark
386
Two circular disks
387
Capacity of a long narrow cylinder
393
The battery and its charge
397
Two cylinders
400
Lemma XVI
401
Glass as a dielectric
402
Theory of this method
403
The two flat conductors between which the plate of air lies or in modern
404
Arrangement of the apparatus
406
On the Thoughts concerning Electricity
409
Early form of Cavendishs Theory of Electricity
411
Experiment of the globe and hemispheres
417
Interpretation of the result
418
Torpedo in a basket in sand shock through wet shoes and through net 421424
421
Capacity of a disk of sensible thickness
423
Two circles
425
Square
426
Three parallel plates
427
Capacity as affected by walls of room
429
Tin cylinder c
430
Comparison of measurements of dielectric capacity
432
On Electrical Fishes
433
Why the Torpedo gives no spark
434
Excess of redundant fluid on positive side above deficient fluid on negative side
437
Pump water rain water salt in 1000 sea water 684
443
Salt and fresh water
444
Other saline solutions
445
Globe and circle
447
519
452

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Page xxxvi - He, who by Reason became an electrician, will hear with reverence " of an instinctive electrician, gifted in his birth with a wonderful " apparatus, and with the skill to use it*. " However I may respect your talents as an electrician, it is cer" tainly for knowledge of more general import that I
Page xlv - even aware of, and we cannot doubt that the result of his enquiries, when successful, gave him a certain degree of satisfaction. But it did not excite in him that desire to communicate the discovery to others which, in the case of ordinary men of science, generally ensures the publication of their results. How completely
Page xxv - DUKE OF DEVONSHIRE. Fellow of the Royal Society, and of the Society OF ANTIQUARIES OF LONDON. Trustee of the British Museum and Foreign Associate in the First Class of the INSTITUTE at Paris.
Page xlvii - which Cavendish had done. About the close of the century Dr Thomas Young, whose acquaintance with all branches of science was as remarkable for its extent as for its profundity, says of this neutral point : "It was from the situation of this point that Lord Stanhope first
Page xxxiii - was for a pointed one, the matter was referred, in 1772, to the Royal Society, and by them as usual to a committee, who after consultation presented a method conformable to Dr Franklin's theory *. The Committee consisted of Cavendish, Dr, afterwards Sir William Watson ; Dr Franklin, Mr J. Robertson (Clerk and Librarian to the Royal Society) ; Mr Wilson and Mr
Page 426 - the short wire. A Leyden jar was charged from a machine in another room, the shell was charged from the jar, and the jar was taken out of the room again. The small brass ball was then connected to earth for an instant so as to give it a negative charge by induction, and was then
Page 59 - provided the depth b/3 is very small in respect of the thickness of the glass ; and if the repulsion is inversely as some lower power than the square, it will be attracted with much more force by etf>, than it is repelled by
Page 429 - and solving equations (16), (17), we find for the charge of the inner shell ° (18) In the original experiment of Cavendish the hemispheres forming the outer shell were removed altogether from the globe and discharged. The potential of the inner shell or globe would then be
Page 429 - 19 ) In the form of the experiment as repeated at the Cavendish Laboratory, the outer shell was left in its place, but was connected to earth, so that A = 0. In this case we find for the potential of the inner shell when tested by the electrometer b)-f(ab)
Page xxxii - See Franklin's Works, Vol. v, p. 430, note. electrician, for a method to prevent a like accident to their magazines at Purfleet. Mr Wilson having advised a blunt conductor, and it being understood that Dr Franklin's opinion, formed upon

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