Show Speeding Up Plowing I Modern l plows are made ol of steel which is hard on the surface and soft soH In the center The soft center acts as a cushion to prevent brittleness brittleness brittle brittle- ness and breakage while the hard surface resists wear Scientific heat treatment methods are employed to assure maximum strength and durability durability dura dura- of the steel used In plow plows Within years after Deeres Deere's invention invention in in- of the steel plow the speed of plowing had been Increased sevenfold sevenfold sev sev- sevenfold fold en-fold largely because of steels steel's contribution to improved design and materials for lor plows and machin machin- ery In 1830 It took a man almost seven hours to to plow one acre of wheat land using a two two horse horse plow A modern tractor-drawn tractor plow can cando cando cando do the same job in iii less than one hour |