Page:Popular Science Monthly Volume 91.djvu/839

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for the Use of Uncle Sam's Boys "Over There'

���Barrels being finished on the outside. Bob is here feeding a barrel into a machine which trims it to size and finishes the outside so that it is exactly concentric to the bore

��The cavities in the breech end of the barrel vary in size. The barrel is held in a fixture while Pete (below) uses the different drills on it. The piping delivers lubricating oil

���Adjusting the telescope sights on rifles. The rifle is first sighted on a target, then the telescope is at- tached to the barrel and trained on the same target

���Gathering and assembling the various parts is bench work. John, shown on the left, takes great pride in his work for it calls for almost as much skill as does the assembling of a watch

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