An outline of the metallurgy of iron and steel; prepared for the use of students at the Massachusetts Institute of Technology, Boston, Mass - Softcover

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. 1904 Excerpt: ... mill with organic materials, such as horse manure, cow hairs, chopped straw, tanning bark, etc. While with green-and dry-sand molds 1 Moldenke, "Transactions American Institute of Mining Engineers," February, 1904. 2 See malleable castings below. 3"Compressed Air," VII, p. 2101. Scott, "Iron Age," November 1, 1900. 5" Stahl und Eisen," 1904, p. 585. patterns are used which have the forms of the articles to be cast, with loam the molds are built up. Loam molds are used mainly with heavy, curved castings. The molding of a spherical kettle is shown in Figures 153 and 154.1 On a cast-iron bed plate, a', is erected a brick dome 4 inches thick, leaving out the keystone; loam serves as mortar. The dome is smeared over. with a 2-inch layer of loam and smoothed off with the core board e. A fire is kindled in the dome and kept smoldering to dry out the brickwork and the loam cover. While drying, the cover is painted with a clay wash mixed with fine charcoal. When dry, the core is covered with a second layer of loam of the thickness of the casting, rounded off by another board attached to the spindle, painted and dried. On top of this come the third layer of loam, 2 inches thick, and lastly a course of 4-inch brick, to which the loam adheres firmly. This third layer with its brickwork forms the cope. The whole is ready to be well baked. After this the cope is lifted off with a crane, the second layer of loam broken and removed, the opening in the core closed, and the cope put again in place. The opening in the cope is left intact and serves as a gate for pouring. Painting the layers of loam where they come in contact with one another prevents their adhering. When the cope has been set, it is keyed to the drag, and the two are r...