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CONTENTS.
ELECTRICITY.
General Phenomena of Electrical Attraction and Repulsion;
Conductors, and Non-Conductors; two Kinds of Electricity 1
Of the Laws which govern the apparent Attraction and Repul-
sion of electrified Bodies
Of the Laws according to which Electricity is dissipated by the
Contact of the Air, and aleg the Supports which retain it
imperfectly
Of Electricity in a State of Equilibrium in insulated Conduct-
ing Bodies
13
22
.
30
Of Combined Electricities, and their Action at a Distance
Theory of the Motions produced in Bodies by Electrical Attrac-
33339
Of the Leyden Jar
Of the Electric Battery
Of the Electric Pile and of the Phenomena presented by Crys-
tals capable of being electrified by Heat
Mechanical and Chemical Effects produced by the repulsive
Force of accumulated Electricity
Of Atmospherical Electricity and Lightning Rods
Of Electric Light
Of the different Methods of developing Electricity
Of the Developement of Electricity by simple Contact
100
103
106
118
121
Theory of the Voltaic Apparatus, on the Supposition that its
Examination of the Changes which take place in the Voltaic Ap-
paratus by its Action upon itself—Effects which hence result
in its Electrical State
Of Secondary Piles
171
184
188
On the unequal Resistance which the two Electricities, when very
weak, meet with in traversing different Bodies
MAGNETISM.
General Phenomena of Magnetic Attraction and Repulsion
General Considerations respecting the Developement of Mag-
Resemblance to the Electric Pile
193
206
210
225
netism.
Determination and Measure of the Directive Force exerted by
the Terrestrial Globe upon Mugnetized Needles
Of the Different Methods of Magnetizing
General Distribution of Free Magnetism in Wires Magnetized
by the Method of Double-Touch-Laws of Magnetic Attrac-
tion and Repulsion
Different Methods of Magnetizing
Of the Intensity of Free Magnetism in each Point of a Needle
Magnetized to Saturation by the Method of Double Touch
Of the Action of Magnets on other Natural Substances
Of the Laws of Terrestrial Magnetism in different Latitudes
Aurora Borealis
Periodical Variation of the Needle
246
249
251
257
Practical Instructions as to the Method of observing the Ele-
ments of Terrestrial Magnetism
ELECTRO-MAGNETISM.
Of the Magnetism imparted to Metals by the Voltaic Current
Analysis of the Electro-Magnetic Forces
Electro-Magnetic Multiplier
Rotatory Motion produced by the Electro-Magnetic Forces
Action of Terrestrial Magnetism upon the Uniting Wire
Motion of Fluids by the Electro-Magnetic Forces
Theoretical Considerations
NOTES.
I. The Torsion Balance
365
II. The best Form of Lightning Rods, extracted from a Paper
VI. Local Attraction and Barlow's Correcting Plate
VII. Theory of Magnetism by M. Poisson
376
384
VIII. Influence of Copper on the Oscillations of the Magnetic
Needle
386
IX. Effects of Temperature on the Magnetic Forces
ib.
X. Diurnal Variation of the Terrestrial Magnetic Intensity
XI. On the Magnetism developed by Rotation
387