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Summary: I. "The other man's job. Carbide in war." Limestone is quarried then lime melted with coke in electrically heated furnaces to form calcium carbide. This is used for acetylene welding and is therefore a vital wartime necessity (welding of tanks, Bren-carriers, jerricans and men-o'-war). Acetylene can also be used, with chlorine, to form a non-inflammable solvent of grease, useful for cleaning engine parts. Carbide is also used in incendiary bombs (magnesium).
II. "Cassino bombing." Distant view of the town of Cassino, then of a military camp where US Air Corps Commander General Cannon outlines the plan of the forthcoming land and air assault. Bostons and Mitchells take off to attack enemy communications (aerial machine-gunning) and the town itself (ruined Monastery is visible). Despite the total destruction of Cassino, Germans continue to fight from deep dug-outs. "Operation proved to all but bombing fanatics that no army can be defeated by bombing alone."