Patent for a machine that is meant to file circular saws. The invention files "saws while mounted side-by side upon a saw arbor, as cotton gin saws usually are; means for moving the file carriage along upon the frame of the machine to locate it in front of the individual saws which are to be filed; means for raising and carrying the file over the saws when the carriage is to be moved; means for securing the file sash on the file carriage and of securing the file carriage upon the main frame by a single act; and means for converting a continuous rotary feed motion of the saws while being filed, to an intermittent motion which rotates the saws step-by-step from tooth to tooth" (lines 15-28).