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allowed to cool alloy annealing anvil applied black hot blow blowlamp blowpipe blue brazing hearth Bunsen burner carbon steel carburising casehardening cast steel centre centre punch CHAPTER cold chisel compound copper cracks cutting edge cutting points cutting tools cyanide dead hard dipped discs Drills effect electric furnaces evenly fairly fire firebrick fireclay flame flat front shank gas ring grinding hardened steel hardening and tempering heat treatment high-speed steel Kasenit knife tool lathe tools left soft machine material metal method middle straw mild steel milling cutters Morganite muffle furnace operations ordinary oxide planisher plate portion possible produce purple quenching rapidly re-heated reamers red heat red-hot round screw shades shape shown in Fig Sievert small workshop smith special steel spring Stellite suitable surface temper colour temperature thin tongs tool bits tool steel top rake tube tungsten carbide wheel yellow