Manual of military engineering . 430& :e Wellerjr Graham, L?^ Litho. London, h^lcLie,. foVUm- CHAPTER XI.—DEFENCE OF POSTS, VILLAGES, ETC. 47 suit our weapons, and executed with the aid of good toolsand engineering skill, will, as a rule, be suitable for our ownuse. For types of such defence, see Pis. 32 to 41. 111. Automatic alarms and flare lights, worked mechanically Alarmsor by electricity, are useful where night attacks may be ex- *^^ flares,pected. They are usually combined with obstacles. One of the simplest alarms is a row of tin pots, each containing apebble, hung on a wire fence so a
Manual of military engineering . 430& :e Wellerjr Graham, L?^ Litho. London, h^lcLie,. foVUm- CHAPTER XI.—DEFENCE OF POSTS, VILLAGES, ETC. 47 suit our weapons, and executed with the aid of good toolsand engineering skill, will, as a rule, be suitable for our ownuse. For types of such defence, see Pis. 32 to 41. 111. Automatic alarms and flare lights, worked mechanically Alarmsor by electricity, are useful where night attacks may be ex- *^^ flares,pected. They are usually combined with obstacles. One of the simplest alarms is a row of tin pots, each containing apebble, hung on a wire fence so as to rattle when the latteris disturbed. A piece of tin, 2 inches to 3 inches in diameter,, the top of a tin pot, bent round the wires answers thesame purpose. Trip wires can be arranged to fire a rifle or tofire a cartridge, which in its turn will ignite a flare {see PI. 43). For electric alarms, see Part 1, Arrangements for automatic alarm signals in connectionwith entanglements or intermediate fences, generally have tobe improvised on the spot with whatever material
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