MOBIUS STRIP

The Mobius strip is sheet of rectangular strip which is given a half-twist with its ends attached.  It has only one edge and only one surface.   It was invented by Augustus Ferdinand Mobius (1790-1868), a German astronomer and mathematician in 1858.

The Mobius strip has found its use commercially.  In fact, a conveyor belt based on the Mobius strip has been patented by B.F.Goodyear Co.  This belt is claimed to lasts longer since the useful surface of the strip is doubled.