. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . nishing with a layer ofi)one on top of the articles, whichshould be i in. deep, so as to well pro-tect the first or top layer of articlesand prevent blistering. The packing completed, the lid is puton and hermetically sealed or luted withloam or fire clay. The box, or boxes,are now placed in a suitable furnace should give a uniformheat of 1,350 to 1,550 degrees Fahren-heit as recorded by the Morse HeatGauge. Overheating is injurious andwill crystalize the iron and make thearticles
. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . nishing with a layer ofi)one on top of the articles, whichshould be i in. deep, so as to well pro-tect the first or top layer of articlesand prevent blistering. The packing completed, the lid is puton and hermetically sealed or luted withloam or fire clay. The box, or boxes,are now placed in a suitable furnace should give a uniformheat of 1,350 to 1,550 degrees Fahren-heit as recorded by the Morse HeatGauge. Overheating is injurious andwill crystalize the iron and make thearticles brittle. In treating wrought ironfor case hardening there are several con-siderations, the principal one being heat,and duration of time for carbonization,same being governed by the size or In our September issue we showed, asour frontispiece picture, the double roll-er lift bridge on the Chicago TerminalTransfer Railroad. We described theroller lift bridge over Newark Bay onthe Central Railroad of New Jersey. Aline of type omitted in one of the open-ing paragraphs failed to make this PACIFIC COAST SCENERY—STE.\MER OX ARROW LAKE. made from wrought iron may be exter-nally converted into steel without de-priving the interior of its natural char-acter or structure. The process is calledCase Hardening. The object of bulk of the work to be point of importance heating standsfirst, for if the primary cause of badcase-hardening could be traced, its ori-gin in a majority of cases would be 448 RAILWAY AND LOCOMOTIVE ENGINEERING October, 1906. found in bad heating. There is nooperation coJinected with case-harden-ing which requires more watchfulnessand gives more anxiety than properheating. It may therefore repay us to examinewith care the conditions to be observedin obtaining results: As to heat, wemust have a thorough admission, uni-form and exacting to. a degree. The heatmust be constant and uniform andshould not exceed 1,350 degrees Fahren-heit, for th
Size: 1755px × 1424px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, booksubjectrailroa, bookyear1901
