. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. d to be the best for tlie maaufacturin;j of cutlery :— Composition of irpting Temperature. Metallic ilixtara. Tin- 7 4 220° Hardly pale yellow. Eazor, 8 4 2^o j Pale yellow to straw Pen-knives. 8^^ 4 232° Straw yellow. Pairs of Scissors 14 4 254> Brown. Clasp-knives, Join-) ers and Carpen- J 19 4 265^ Purplish Colored. ter
. The universal assistant, and complete mechanic : containing over one million industrial facts, calculations, receipts, processes, trade secrets, rules, business forms, legal items, etc., in every occupation, from the household to the manufactory. d to be the best for tlie maaufacturin;j of cutlery :— Composition of irpting Temperature. Metallic ilixtara. Tin- 7 4 220° Hardly pale yellow. Eazor, 8 4 2^o j Pale yellow to straw Pen-knives. 8^^ 4 232° Straw yellow. Pairs of Scissors 14 4 254> Brown. Clasp-knives, Join-) ers and Carpen- J 19 4 265^ Purplish Colored. ters Tools ) Swords, Cutlasses,) and Watch[48 4 2SS° Bright bine. Springs ) Stilettos. Boring) Tools, and Fine J 50 2 2C2blu«. Saws ) Ordinary saws j ^ se^Jd ou!i ^*^ Blackish olne. Such tools as tire required to work iron and other metals, andhard stones, are heated to a bright yellow : c-oiniug dies, en-gravers tools, and wire-drawjng i)]ates follow next to sts-aw yellow ;carpenters tools t<i purfilish red, while .«iKh tools and objects arerequired to be elastic are heated to the violet or deep blue tint. ThaIfeflB steel id heated the harder It but also the more brittle. machinists tools. 471 ti^i. ^iM TXfiA,
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Keywords: ., bookcentury1800, bookdecade1870, booksubje, booksubjecttechnology
