A lathe for turning spirals has been patented by Mr. Silas Moore. of Cleveland, O. It feeds the work regularly against a revol ving cutter, which may be quickly withdrawn and returned, so spirals may be cut either right or left handed, cylindrical, tapering, or wave pattern. and the pitch may be regulated at the beginning of each job by arranging the gear wheels in proper relation to the screw.
This article was originally published with the title "Mechanical Inventions" in Scientific American 52, 26, 408 (June 1885)