Among the recent contributions of applied science:
>A tractor whose body can be raised between its wheels to pass over the high tops of growing corn, lowered so that its centre of gravity hugs the ground to give extra traction for plowing. Patent was granted to Henry Ford of Dearborn, Mich.
> A magnetic gauge which measures the thickness of sheet steel from only one side. Until now such measuring has been done with calipers which must feel both sides of a plate. The new device, developed by General Electric, sends a current through the steel, records its changing magnetic reluctance as...
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