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Abstract of the Proceedings Volume 18
Abstract of the Proceedings Volume 18

Abstract of the Proceedings Volume 18 by Massachusetts Institute of Arts

Abstract of the Proceedings Volume 18
Author: Massachusetts Institute of Arts
Number of Pages: 220 pages
Published Date: 01 May 2012
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781236156464
Download Link: Abstract of the Proceedings Volume 18

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1890 Excerpt: ...are most desirable in a material for use in boiler construction. They are ductility, uniformity, strength, durability, and cheapness. Ductility enables an inspector to detect an overstrain which is sufficient to deform the boiler without injuring it. A non-ductile metal, like cast iron, gives but slight notice of overstrain before it occurs, while a ductile metal, like ingot iron or homogeneous steel, -made by the open-hearth process, will bulge under overstrain without being injured. When the material is of uniform quality its strength and ductility can be accurately ascertained by aid of a testing machine, and a designer knows what he has to depend upon, while with a material of varying quality the designer must often provide a great / excess of material for fear that that which seems to be strong may be in reality weak. The most objectionable lack of uniformity exists whenever some such substance as dirt is irregularly mixed with the boiler material; thus the thick plates of wrought iron, which are frequently used in ordinary boilers, are not of uniform nature throughout, but layers of slag or dirt are interposed between the particles of iron. Sometimes the quantity of dirt so mixed with wrought iron is very great, and explosions have resulted from the use of such metals. Strength is a valuable quality, because a thin plate of strong metal may have a resistance equal to that of a thick plate of the weaker metals; thus a good quality of so-called steel boiler plate may have the same strength as a wrought-iron plate which is onefourth thicker. It will be necessary to omit from consideration this evening most substances not very commonly employed as boiler materials. Nothing will be said of cast iron other than this: when a large mass of cast iron is melted ..

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