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LONDON:
HARDWICKE & BOGUE, 192, PICCADILLY, W.

1879.

[All rights reserved.]

Ap28-05-0.chi

CONTENTS.

PAGE

Sir Humphrey Davy - Electric light first produced chemically —
Faraday's discovery of electro-magnets, and thereby of mechanical pro-
duction of electric light - Machines of Pixii, Clark, and Nollet, leading
to those of Holmes and of the AMiance Company, in use in English and
in French lighthouses - Principle of reaction between electro-magnets
- Magneto-electric and dynamo-electric machines — Single-light and
many-light machines — Commutators — Continuous and alternating-
direction currents — Experiments at South Foreland by Trinity House
- Experiments of Franklin Institute at Philadelphia .. .. .. ..

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Holmes

Alliance ..

South Foreland, Souter Point, Lizard, and Cape La

Gramme

Hève Lighthouses. Northern of France Ry., Powell,

Siemens ..

and Albert Hall.

| Lyons Ry., Western of France Ry., and Gaiety
Lontin . Theatre, London.

| Avenue de l'Opéra, Thames Embankment, Holborn

Jablochkoff .

1 Viaduct, Billingsgate Market.

Rapieff.. .. •Times' Office.

Wallace-Farmer, Liverpool Street Station, London.

Economic result afforded by effective illuminating power in proportion
to working cost — Comparison of different examples — Effect of sub-
division of the light — Table of working of different machines .. .. ..

74

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