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P r~e d i w . 1 CORREBPONDENOE ON ARMOUR-PIERCING PBOJECTILEB. 57 hardened, in water which flowed in a jet on to the inside col. Cubillo, and the outside. The temperature for this second tempering was 780" C. for the projectile, and 22' C. for the water. Thedoi:10.1680/imotp.1903.18069 fatcat:dsqq5l5rszglrat3nuz4twnv2u