WRINKLES
IN
ELECTRIC LIGHTING.

[iii]

WRINKLES
IN
ELECTRIC LIGHTING.

BY

VINCENT STEPHEN.

E. & F. N. SPON, 125, STRAND, LONDON.

NEW YORK: 12, CORTLANDT STREET.

1888.

[v]

INTRODUCTION.

In the following pages it is my intention to give engineers on board ship,who may be put in charge of electric lighting machinery without having anyelectrical knowledge, some idea of the manner in which electricity isproduced by mechanical means; how it is converted into light; whatprecautions must be used to keep the plant in order, and what to do in theevent of difficulties arising. I do not therefore aim at producing aliterary work, but shall try and explain everything in the plainestlanguage possible.

[vii]

CONTENTS.

The Electric Current, and its Production byChemical Means.
	PAGE
Production of electric current in chemical battery—Current veryweak—Current compared to circulation of the blood—Strength andvolume of current—Pressure not sufficient without volume—Actionof current is instantaneous—Resistance to the passage of thecurrent—Copper the usual metal for conductors—Heat produced bycurrent when wire is too small	1

Production of Electric Currents by Mechanical Means.

Magneto-Electric Machines.

Current produced by mechanical means—Alternatingcurrent—Magneto-electric machines—Shock produced by interruption ofcurrent—The current must be commutated—Description ofcommutator—Current, though alternating in the dynamo, iscontinuous in the circuit—Continuous current used for electro-plating	5

Dynamo-Electric Machines.

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WRINKLESINELECTRIC LIGHTING.