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the short pieces separately. Different size tubes are often used for the fuses of different size shells; those for a 4-inch shell (that is, for a shell to be shot from a 4-inch mortar) are commonly made from tubes 5/16 inch in internal diameter and %

Figure 33. Bombshells for 4- and 6-inch Mortars. (Courtesy National

Fireworks Company and the Boston Globe.)

Figure 33. Bombshells for 4- and 6-inch Mortars. (Courtesy National

Fireworks Company and the Boston Globe.)

inch in external diameter. Fuses are generally attached to the front end of the bombshell. The forward-pointing end of the tube, which is outside the shell and receives the fire, is filled flush with the composition. The other backward-pointing end, inside the shell, is emptv of composition for % inch of its length; a

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