The blacksmith's guide : valuable instructions on forging, welding, hardening, tempering, casehardening, annealing, coloring, brazing, and general blacksmithing (1907)
Sallows, J. F. (James Francis), 1865- · Brattleboro, Vt. : The Technical Press · leaf 90
HARDENING AND TEMPERING 77 tools hardened by the methods described in this book should be dipped. It will also serve in annealing tool steel. No. 2 on the first chart indicates the correct color for dipping springs. This color will also do for small wood-working tools. … Fig. 6. Open Forge for Hardening and Tempering. No. 3 is suitable for cold chisels, punches, small dies, small twist drills, small taps, etc. No. 4 for larger taps and dies, larger punches, shears, large twist drills, etc. No. 5 for all lathe and planer tools for cutting wrought iron and for tools…
Blacksmithing
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
