THREE:Tools should never be tempered by immersing their edges or cutting parts in the bath, and then allowing the heat to "run down" to attain a proper temper at the edge. I am well aware that this is attacking a general custom, but it is none the less wrong for that reason. Tools so hardened have a gradually diminishing temper from their point or edge, so that no part is properly tempered, and they require continual re-hardening, which spoils the steel; besides, the extreme edge, the only part which is tempered to a proper shade, is usually spoiled by heating and must be ground away to begin with. No latheman who has once had a set of tools tempered throughout by slow drawing, either in an oven, or on a hot plate, will ever consent to point hardening afterwards. A plate of iron, two to two and one-half inches thick, placed over the top of a tool dressing fire, makes a convenient arrangement for tempering tools, besides adding greatly to the convenience of slow heating, which is almost as important as slow drawing. The writer has by actual experiment determined that the amount of tool dressing [117] and tempering, to say nothing of time wasted in grinding tools, may in ordinary machine fitting be reduced one-third by "oven tempering."
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THREE:"Think," Leona whispered, "set your wits to work. Meanwhile I have asked him to come here tonight to dine. Between now and then we shall surely find some way. At present I can only think of drugging and stealing his keys. But with our experience we can surely find better methods than that."Balmayne danced down the lane with impotent fury. Despite her peril and the fear that was in her heart, Hetty smiled. Here was a daring and audacious rascal engaged in some desperate and, no doubt, cunning scheme who was utterly baffled by a mere girl and a hairpin.
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