. Cassier's magazine. CASSIERS MAGAZINE. 54-INCH SLOTTING MACHINE BUILT BY THE NILES-BEMENT-POND CO., NEW YORK BIG MACHINE TOOLS mately parabolic, or cambered, or semi-parabolic. Snugness of design is alsostudied in many ways, as in keepingtool boxes as closely as possible to theirslides, in bringing beds and screws closeto the areas of severest stress; and wherethis is not practicable, then it becomesnecessary to receive the strains on slidesof ample width and length in order toprevent jerky movements and lost mo-tion. Mass, again, involves casting inpieces, because single castings of ab-norm

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. Cassier's magazine. CASSIERS MAGAZINE. 54-INCH SLOTTING MACHINE BUILT BY THE NILES-BEMENT-POND CO., NEW YORK BIG MACHINE TOOLS mately parabolic, or cambered, or semi-parabolic. Snugness of design is alsostudied in many ways, as in keepingtool boxes as closely as possible to theirslides, in bringing beds and screws closeto the areas of severest stress; and wherethis is not practicable, then it becomesnecessary to receive the strains on slidesof ample width and length in order toprevent jerky movements and lost mo-tion. Mass, again, involves casting inpieces, because single castings of ab-normal dimensions are difficult to make, as is frequently done in the case of smallmachines, engines, and cranes. It isdifficult to make massive castings, be-cause they require special tackle in thefoundry, powerful cranes, big core-dry-ing stoves, cupolas, or receivers of largecapacity, and large doors for exit. Itis equally difficult to handle them in themachine shop, some of the reasons forwhich are similar to those just noted inthe foun

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