Hardening, tempering, annealing and forging of steel; a treatise on the practical treatment and working of high and low grade steel .. . AngularI^IG. 107.—ANGULAR TYPE OI*MILLING PIG. 108.—FORMED TYPE OEMILLING CUTTER. Fig. 108. The cutting edge of this class is of an irregular outline^When properly backed off, these cutters can be ground and retaintheir original form. Gear cutters, tools for grooving taps, etc.,are all classed as form cutters. Among the numerous engravings in this book will be found

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