Science: Casting v. Forging

First, welding began to replace riveting in ship-and plane-building (TIME. Dec. 15). Now cast steel is replacing forged steel, and in tanks it is replacing both riveted and welded armor plate. Engineers call this technological shift "little short of a revolution."

Said Ford's chief metallurgist, Russell H. McCarroll, last week: "By making an airplane cylinder barrel as a centrifugal casting instead of a forging, we helped break all four of the main bottlenecks in production: materials, time, skilled manpower and machine tools."

Pound or Pour? Sample military gadget is a machine-gun trunnion block,...

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