ung if desired. Arranged toslide through the head so as to bisect the right angleformed by the legs is a 13-inch scale from which an ex-tension, E, projects perpendicularly. When the keyway is to be marked on the end of theshaft, the tool is placed astride the shaft with the spirit-level, C,… … V^ A SCALE FOB MABEIN6 KEYWAYS. Then, by reading from the level, C, the extension, S,can be made to indicate the proper line on the shaft.By turning the tool as shown by dotted lines, thereading edge of the scale is horizontally disposed andthe horizontal center of the shaft determined as…
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