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Figure 34. Manufacture of Globe Torpedoes. Introducing gravel and closing the paper capsules.

Globe Torpedoes

Small cups of manila paper, about % inch in diameter and % inch deep, are punched out by machine. They are such that two of them may be fitted together to form a box. The requisite amount of powdered potassium chlorate is first introduced into the cups; then, on top of it and without mixing, the requisite amount, already mixed, of the other components of the flash fulminating mixture is added. These other components arc antimony sulfide, lampblack, and aluminum. Without disturbing the white and black powders in the bottoms of the cups, workers then fill the cups with clean coarse gravel and put other cups down upon them to form closcd % by % inch cylindrical boxes. The little packages are put into a heated barrel, rotating at an angle with the horizontal, and are tumbled together with a solution of water-glass. The solution softens the paper (but later

109 . , hardens it), and the packages assume a spherical shape. Small discs of eolored paper (punchings) are added a few at a time until the globes are completely covered with them and have lost all tendency to stick together. They are then emptied out of the

Figure 35. Manufacture of Globe Torpedoes. Removing the moist spheres from the tumbling barrel. (Courtesy National Fireworks Company and the Boston Globe.)

Figure 34. Manufacture of Globe Torpedoes. Introducing gravel and closing the paper capsules.

Figure 35. Manufacture of Globe Torpedoes. Removing the moist spheres from the tumbling barrel. (Courtesy National Fireworks Company and the Boston Globe.)

tumbler, dried in steam-heated ovens, and packed in wood shavings for storage and shipment.

Railway Torpedoes

A railway torpedo consists of a flat tin box, of about an ounce capacity, filled with a fulminating composition and having a strip of lead, soldered to it, which may be bent in order to hold it in place upon the railroad track. It explodes when the first wheel of the loeomotive strikes it, and produces a signal which is audible to the engineer above the noise of the train. Railwav tor-

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