File:Railway master mechanic (microform) (1895) (14758525811).jpg

Identifier: railwaymastermec33newy (find matches)
Title: Railway master mechanic (microform)
Year: 1895 (1890s)
Authors:
Subjects: Railroads Railroads
Publisher: New York : (Simmons-Boardman Pub. Corp.)
Contributing Library: MIT Libraries
Digitizing Sponsor: Boston Library Consortium Member Libraries

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as to thebest way to pour a steam cylinder. Some cling to the oldmethod of casting on end with a riser the full size and thick-ness of the cylinder wall extending an indeterminate num-ber of inches above the flange, to receive all the dirt, whichis afterwards machined off. Some have gates on the flanges,and others resort to the use of pop gates on top. But themost reliable and the most logical method is to use a coreor drawgate as near to the bottom of the mould as pos-sible, with the cylinder cast on the side, so that any dirtthat may enter will lodge under the exhaust or port cor-,where it can do little if any harm, and gradually fill themould without wear and tear on the cores or surface of thesame. It also reduces the tendency to shrinkage or spongyspots in or about the bore of the cylinder. While it is notnecessary to cast on end, it is true that much dirt will arisein the head when this method is used, but it is possible andpractical to cast them on the side when the workmanship
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Corner of Woodworking Department would include the fuel for drying and the use of an iron flask.The blackings used on a dry-sand cylinder and its coresare often responsible for dirt in the casting. A blacking thatis applied wet should, when dried, be hard and firm, andshould be able to withstand a vigorous rubbing with theband without developing dust or a disposition to rub off,and should never come off under the application of the softbrush. If it does there are several remedies. One is to mixthe blacking with clay wash; another is to go over the fin-ished blacking with a camel-hair brush and molasses water;and the third, which the writer has found of the greatestservice, is to mix from 10 to 20 per cent of talc or soap-stone with the blacking. In the case of very poor blackingand the qualities of some sands, it may be necessary to usetwo or three of these remedies, but usually the talc is allthat is required. The cores should be blacked and treatedin the same manner as the mould, as

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