File:Manual of military engineering (1905) (14802404153).jpg

Identifier: manualofmilitary00grea (find matches)
Title: Manual of military engineering
Year: 1905 (1900s)
Authors: Great Britain. War Office
Subjects: Military engineering
Publisher: London : Printed for H. M. Stationery off., by Harrison and sons
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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Text Appearing Before Image:
430& :e Wellerjr Graham, L?^ Litho. London, h^lcLie,
Text Appearing After Image:
To Follow Plate 42
CHAPTER XI.—DEFENCE OF POSTS, VILLAGES, ETC. 47
suit our weapons, and executed with the aid of good tools
and engineering skill, will, as a rule, be suitable for our own
use. For types of such defence, see Pls. 32 to 41.
111. Automatic alarms and flare lights, worked mechanically Alarms
or by electricity, are useful where night attacks may be ex- ^{and flares}.
pected. They are usually combined with obstacles. One
of the simplest alarms is a row of tin pots, each containing a
pebble, hung on a wire fence so as to rattle when the latter
is disturbed. A piece of tin, 2 inches to 3 inches in diameter,
e.g., the top of a tin pot, bent round the wires answers the
same purpose. Trip wires can be arranged to fire a rifle or to
fire a cartridge, which in its turn will ignite a flare (see PL. 43).
For electric alarms, see Part 1,1.M.E.
Arrangements for automatic alarm signals in connection
with entanglements or intermediate fences, generally have to
be improvised on the spot with whatever material

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