. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . chemical combination. At TerreNoire, for example, the steel is oil hardened, but not forged, and the quality varies in dif-ferent projectiles, being softest in the largest calibers; but the degree of hardening variesalso, so that the final product possesses nearly the same degree of hardness in all cases. projectiles are generally made of crucible steel, forged, and oil hardened; but herethe quality of th
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . chemical combination. At TerreNoire, for example, the steel is oil hardened, but not forged, and the quality varies in dif-ferent projectiles, being softest in the largest calibers; but the degree of hardening variesalso, so that the final product possesses nearly the same degree of hardness in all cases. projectiles are generally made of crucible steel, forged, and oil hardened; but herethe quality of the steel is the same for all calibers, and the hardening process differs. Thatfor the 34-cmt. shell is described as follows: The projectile is brought to a cherry-red heatthroughout, plunged in oil, and kept immersed until cold; it is then brought again to acherry-red and dipped in cold water as far as the front band, where it is kept eight or tenminutes; finally it is wholly immersed in oil until cold. Krupp projectiles are of crucible steel, and the final process is oil hardening; it is saidthat a file will not bite anywhere on the surface. The use of steel has lately been. 10.—The quarter bale. PROJECTILES. 673 extended to the manufacture of common and shrapnel shell also; the thickness of the shellwalls is thereby greatly reduced, while retaining all the strength of the cast-iron projectile,so that the interior capacity for bursting charge or bullets, and consequently the efficiencyof the shell, has been correspondingly increased. The projectiles are generally made of cast-steel, but in England the difficulty of procuring sound small castings led to the introductionof forged steel for the smaller calibers, and the superiority of these over the cast-steel oneswas so marked that they are now made for all calibers. In this country cast-iron shell have been produced with facility at the various governmentestablishments for a number of years. The efforts to obtain cast-steel sh
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
