. Railway master mechanic [microform] . ary machinery steel, taken from stockon hand. The rods on this engine (No. 4), it shouldbe -stated, were straight from shoulder to shoulder,while those of the duplicate (No. 5) were reduced inthe body, having a collar %-in. larger than the rodand Vi-in. wide next to the shoulder at the crossheadend. After having been in service about 14 months, one ofthe low pressure rods of No. 5 let go, and smashedthe cylinder-head, without, however, doing any veryserious damage. Within a few weeks the overhauledengine did the same thing. This was becoming a serious ma
. Railway master mechanic [microform] . ary machinery steel, taken from stockon hand. The rods on this engine (No. 4), it shouldbe -stated, were straight from shoulder to shoulder,while those of the duplicate (No. 5) were reduced inthe body, having a collar %-in. larger than the rodand Vi-in. wide next to the shoulder at the crossheadend. After having been in service about 14 months, one ofthe low pressure rods of No. 5 let go, and smashedthe cylinder-head, without, however, doing any veryserious damage. Within a few weeks the overhauledengine did the same thing. This was becoming a serious matter, and after somecareful consideration the writer ordered some genuineSwedish iron to make rods of. It was beautiful stock,and so soft that it acted almost like lead in the lathe,being very difficult to get a smooth finish on. A setof these were put into one of the engines at once, andran about four months, when one of them let go inthe same way. The rods that broke were all low-pressure ones, due undoubtedly to the fact that in the. Phor-ous. Sili-con. Carbon. Fig. 12.—GALENA LABORATORY—Viscosimeters emergency, or starting gear, those cylinders get al-most full boiler pressure—180 lbs. per sq. in. Therods were all broken in the same ^ ay, and right inthe shoulder, the metal cracked at top and bottom,and the crack gradually widened, as could be seen bythe worn appearance of the upper and lower segmentsof the break, which gradually approached each otheruntil only a narrow horizontal strip of solid metal wasleft across the middle of the rod when the final ruptureoccurred. Soon after ordering the Swedish iron, the writercame across one or two articles bearing upon this sub-ject of the endurance of soft and hard steel or ironunder fatigue, and describing tests made to elucidatethis point, notably those of the Pope Tube Companyand the Bethlehem Iron Company, which showed quiteclearly that high-carbon steel was infinitely better thanlow-carbon, and that nickel-steel was bett
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Keywords: ., bookcentury1800, bookdecade1890, bookpublishernewyo, bookyear1895
