MODERN ELECTRICITY.

CHAPTER I. The Four great qualities of Electricity which make
its modern uses possible.--The universal wire.--Conductors and
non conductors.--Electricity an exception in the ordinary Laws
of Nature.--A dual nature: "Positive" and "Negative."--All
modern uses come under the law of Induction.--Some of the laws
of this induction.--Magnets and Magnetism.--Relationship between
the two.--Magnetic "poles."--Practical explanation of the action
of induction.--The Induction Coil.--Dynamic and Static
Electricity.--The Electric Telegraph.--First attempts.--Morse,
and his beginnings.--The first Telegraph Line.--Vail, and the
invention of the dot-and-dash alphabet.--The old instruments and
the new.--The final simplicity of the telegraph.

CHAPTER II. The Ocean Cable.--Differences between land lines and
cables.--The story of the first cable.--Field and his final
success.--The Telephone.--Early attempts.--Description of Bell's
invention.--The Telautograph.--Early attempts and the idea upon
which they were based.--Description of Gray's invention.--How a
Telautograph may be made mechanically.

CHAPTER III. The Electric Light.--Causes of heat and light in
the conductor of a current.--The first Electric Light.--The Arc
Light, and how constructed.--The Incandescent.--The
Dynamo.--Date of the invention.--Successive steps.--Faraday the
discoverer of its principle.--Pixu's
machine.--Pacinatti.--Wilde.--Siemens' and Wheatstone.--The
Motor.--How the Dynamo and Motor came to be coupled.--Review of
first attempts.--Kidder's battery.--Page's machine.--Electric