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Construction Rnaces: REFRACTORIES. One of the definitions the word "refractoriness" is "the capacity of a aterial to resist a high temperature." The in-metallic materials which have this property, id which are used for the construction rnaces of rnaces, are known as "refractories." Without em, high temperatures could not be confined or messed for industrial use, and it would be im-ssible to reduce iron, copper, aluminum and her metals from their ores. Without refrac-ries, it would be impossible to produce china-ire, porcelain, glass, Portland cement, steam wer or steam generated electric power.
The cover was an in dustrial photograph by Margaret Bourke-White of th< construction rnaces of a great dam near Fort Peck, Montana, k the style for which, as a photographer for Fortune, she was noted. The opening picture story, however, focused not on the construction rnaces, but on the life of the builders oi the dam and their families in temporary cities in the desert. It was not what the editors had assigned, and they wrote, by way of introduction:
What the Editors expected—for use in some later issue-were construction rnaces pictures as only Bourke-White can take them. What the Editors got was a human document of frontier life which, to them at least, was a revelation.
The requirements of the Rules apply to steel vessels of all welded construction rnaces. Riveted construction rnaces, where used, is to comply with the applicable parts dealing with riveting in the 1969 edition of the Rules. |
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