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across the Atlantic and back, or around the world. Some of them now carry in addition to torpedo tubes cannon of as much as six inches caliber, for use when they are not fully submerged.

MANY INVENTIONS War in the air comprises the use of vast dirigible balloons, and of swift and agile aeroplanes driven at almost incon

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FIG. 1 FIG.2 FIG. 3

FIG.4 TYPES OF SHELLS Fig. 1.-Shrapnel shell, packed with bullets that spread. Fig. 2.-A French quick-firer shell, like an enlarged rifle cartridge. Fig. 3.-The “Universal” shell, combining the action of shrapnel and high explosives. Fig. 4.A fuse-setting machine.

ceivable speed. Bombs and rockets are used for signaling and for illuminating purposes on a scale never before known. Poisonous gases are employed, blown against the enemy through pipes from vast retorts. These gases are sometimes asphyxiating and life-destroying, sometimes they are calculated to destroy the sight of the enemy, and some

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FIELD CASEMENTS AND BOMB-PROOFS

SECTION OF INTRENCHMENT IN FIRM SOIL AND MIL

ITARY NAMES OF PARTS

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4:1

Inside

Outside

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PALISADES IN DRY DITCH IN FRONT OF PARAPET

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Photo by Paul Thompson.

The British GUNS
One of the coast batteries of British artillery. At the left of the picture is seen a range finder and in the center a group of officers

watching the effect of the fire.

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RUSHING A GUN TO THE FIRING LINE Back and forth over the wasted plains and ruined cities of France and Flanders, surged the war.

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