Variable speed belt drive sheaves are common on combines. At their simplest, a pair of sheaves at one end of a belt moves closer together or farther apart. Another pair of sheaves at the other end of ...
In 1940, the French mathematician and artillery officer Jean Leray was taken prisoner by the Germans. He told his captors that he was a topologist, fearful that if they discovered his true area of ...
THE time for toil is past, and night has come,— The last and saddest of the harvest-eves ; Worn out with labor long and wearisome, Drooping and faint, the reapers hasten home, Each laden with his ...
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