Army Demonstration(Continued from Page One)•'For example, 340 pounds of copper, lend and zinc go into a Jeep, whllo more than 500 pounds of copper are needed for a light tank which was demonstrated in the battle/* he said.A 50-callber machine gun ammunition case contains 70 per cent copper and 30 per cent zinc, while a bullet Jacket has 00 per cent copper and 10 per cent zinc. A flight of 60 bombers will consume this ammunition at the rate of seven tons of copper per minute. That means 700 tons of ore representing tho labor of three or four men for the entire month/* he disclosed.Tho demonstration was under the direction of Colonel Alexander T. Mlt;5-Conc, headquarters, Elghty-flrst division artillery, and includes an antiaircraft gun drill, antitank gun drill, cargo truck and Jeep trick, tank demonstration and an attack on a fortified position.FALL STYLUS