Don Mills, Ont. : Southam-MacLean Publications · leaf 192
aw is now fully formed ready to be hardened andtempered. These operations are most important and mys-terious. The soft steel is heated in an oven until it be-comes cherry red. It is then plunged suddenly into anoily hardening fluid. A wonderful internal change has takenplace in the arrangement of… … Fig. 7. cool it is heated again to about half the former temperature,this time under pressure. By this method much of the hard-ness is withdrawn and the saw comes to the right toughnessand spring. The pressure keeps it very flat, otherwise theheat would greatly distort the plate. The inspector…
Furniture industry and trade · Woodworking industries
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