Sentence:  23. George C. howard, Philadelphia, U.S. / <small>GRINDSTONE HACKER</small>. / "Report".--Commended for the contrivance of an instrument, called a "<WSD>hacker</WSD>," that is used in trimming grindstones. This <WSD>hacker</WSD> turns with the stone, and is drawn across in a slide rest, and fulfills its important function satisfactorily. 
Meaning of the word marked with <WSD> tags:  Something that hacks; a tool or device for hacking.