Sentence:  The “<WSD>Jim Crow</WSD>” machine, which is Whitworth's patent, was new to some of the visitors. … But with a “<WSD>Jim Crow</WSD>” a cut is obtained both ways. 
Meaning of the word marked with <WSD> tags:  A double-action planing tool invented by (Joseph Whitworth), in which the blade ‘jumps' to face the other way on the back-stroke.