Engineering Wonders of the World
Volume I
Forfatter: Archibald Williams
År: 1945
Serie: Engineering Wonders of the World
Forlag: Thomas Nelson and Sons
Sted: London, Edinburgh, Dublin and New York
Sider: 456
UDK: 600 eng - gl.
Volume I with 520 Illustrations, Maps and Diagrams
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228
ENGINEERING WONDERS OF THE WORLD.
MAP SHOWING THE DEVELOPMENT OF LONDON
TUBE RAILWAYS AT THE END OF 1890.
The heavy black line indicates completed construction;
open lines signify future developments.
DEVELOPMENT AT THE END OF 1900.
the Tower Subway, driven under the Thames
near the famous fortress. The engineer of
this tunnel, which has an in-
The ternal diameter of 6 feet 7
Tower was Mr. J. H. Great-
Subway.
head, whose invention of the
tunnelling shield named after him entitles him
to be regarded as the practical author of the
“ Tubes ” of London. The principle of the
shield will be described on a later page.
With the help of this device, the tunnel was
driven at a maximum speed of nine feet per
day, work being carried on continuously. For
a short time after the opening of the subway
in 1869 passengers were transported under the
Thames in a small car operated by a cable.
Subsequently, as the scheme did not pay its
way, the steam-worked lifts giving access to
DEVELOPMENT AT THE END OF 1902.
DEVELOPMENT AT THE END OF 1904.
DEVELOPMENT AT THE END OF 1906.
Note.—Additions made to the lines shown in the previous
map are indicated by a zigzag line, thus:—
the tunnel were replaced by spiral staircases,
and passengers had to walk from one side of
the river to the other. The opening of the
Tower Bridge in 1898 led to the subway being
closed to traffic.