This is a complete master-tool, filling every necessary qualification for all plain outside brass work, and doing the duty on that metal which the- front tool and righl and left hand side-tools do on wrought iron. As shown in the- engraving, it is ground to suit either roughing out or finishing. For very slight work, which is liable to spring, it may be ground a little more keen on the side faces, the top face not" requiring, under any possible circumstances or conditions, to be ground keener than shown above. When held far out from the tool-post, the top face should be ground away, sloping down toward the cutting edge, which is done to prevent the tool from jarring or chattering. It should be hardened right out, and not lowered or tempered at all, and used for roughing out at the following speed and feeds:

For finishing-cuts, the cutting speed may be increased by about one fifth, which rule will also apply to its use upon yellow brass for roughing out as well as finishing purposes.