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Show at once. In the si'ii,J place the Activity Ac-tivity of the wireless apparatus of both iillii-c and German machines overhead, over-head, signaling directions to batteries, would "jam" the connection necessary to lire the mine by activity. Italian Works Fake. Some years ago an Italian naval oflicer named Valatti announced that he had invented a contrivance for detonating det-onating explosives at some distance off by wireless rays. Tests were made at Ostin. (harbor of Koine,) and on one occasion he apparently exploded a mine buried on the fur side of one of the hills surrounding the harbor. He Mashed the rays from an Italian warship. war-ship. Investigation indicated, however, how-ever, that he used fake mines, prepared pre-pared automatically so they would explode ex-plode after a certain time had elapsed. Griniivl Matthews' proposition Is quite different, however, the actual starting of the contrivance for setting off the bomb being begun by the effect ef-fect of the ray of light entering the eye of the lens, and thence being carried car-ried out by the electric battery and the clockwork. The mines can be set off In daylight, ordinary light having no effect on the lens. Only if the lens were directed squarely at the sun would It produce the required effect. LIGHT RAYS NEW AID IN WARFARE Englishman Invents flcmarkab!e Engine of War Called "Light-o-Mine." IS USED IN FRENCH ATTACKS Mines Laid in Captured Trenches Are Set Off by Ray of Light When Reoccupied by the Enemy. Paris.- Light as an adjunct and aid of modern warfare Is the newest ally of the allies, summoned to aid in the campaign against the central powers by II. Grindell Matthews, au Englishman. English-man. Grindell Matthews' engine of war is called a "light-o-mine," aud comprises com-prises an electro-clockwork arrangement arrange-ment that Is attached to a series of bombs and which is set off by a ray of light. The new form of trench fighting, the raiding tactics first carried car-ried out by the British and now being be-ing engaged in to a great extent by the Russian troops on the French front and by the pollus themselves, avails itself largely of the use of this "llght-o-mlne." The apparatus Itself Is about a yard long and four inches square. It consists of a lens at one end, open and resembling a pocket flash lamp. Inside In-side is a dry battery, a sensitized plate and a clockwork, and from that lead wires. When a raid is made on an enemy trench, this apparatus is carried, and with it a line of trench bombs. Now a line of trench bombs consists merely of 20 or 50 or 100 or 200 yards of ordinary iron piping, a little larger, for instance, titan gas piping. The piping is cut in suitable lengths say 10 or 15 feet long each. From each of the ends protrude two bits of wire, the positive aud the negative, nega-tive, for the current to be transmitted to detonate the bombs. The piping is packed tightly with alternate chambers cham-bers of T N T, as the allies' standard high explosive trinitrotoluol is called, and shrapnel, bits of iron nails aud slugs of metal. Mines Are Planted. The raiding party carrying this equipment and preceded by a wave of grenade throwers, raids the enemy trench after a short but Intense bombardment. bom-bardment. They bayonet or blow up with grenades the survivors in the trench, then hastily lay this mine of piping, all connected up with the wires, in the bottom of the trench, covering it over with a few spadefuls spade-fuls of em-th. The end of the long pipe-line of bombs is attached by wires to the "light-o-mine" ; apparatus, appar-atus, aud this is hidden in the enemy trench, leaving the bull's-eye lens exposed ex-posed and pointing back at some object ob-ject in the Franco-British lines. About this time the German batteries batter-ies in the rear have been advised that an enemy detachment is occupying a front trench sectitj at that point and a few shells bogin to drop in. That is the signal for the raiders to clear out aud return to their own positions. Cautiously the enemy reconnoiters forward for-ward when he hears nothing and no shots are fired from the lost trench. Finally he approaches nlid finds it deserted. de-serted. Ti e first thing he does is to clamber over the parapet and look for wires leading across the No Man's Land to the raiding party's positions, an--; finding none, has no suspicion that o. mine has been placed in his trench. Troops are sent forward to reoecupy the trench, and just when it is comfortably com-fortably held by the Germans again, a star shell is sent up from the Franco-British position in a line following that toward which the lens of the "light-o-mine" is pointed. The light serves to set off the long line of piping, full of TNT and shrapnel, and the Germans are blown out of the trench. It would not be feasible to detonate the mines by wireless on the principle used by John Hayes Hammond, Jr., In guiding his manless boat, as in the first place it would thus be necessary to place aerials above the German trenches after a mine were laid und the enemy would notice the uprights |