. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. e space, and with a view of limiting this as muchas possible, moulding machines, for work involving much duplication, have been extensivelyemployed. In addition, such machines efiect neatness and cleanliness in carrying on the work, andin a measure obviate the necessity of employing very skilled labour ; while the increase in the rateof the most economical results. Such a mode as that of Jobsons, described in this Dictionary, p. 1540, is a step in this direction ; 654 FOUNDING. and anoth
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. e space, and with a view of limiting this as muchas possible, moulding machines, for work involving much duplication, have been extensivelyemployed. In addition, such machines efiect neatness and cleanliness in carrying on the work, andin a measure obviate the necessity of employing very skilled labour ; while the increase in the rateof the most economical results. Such a mode as that of Jobsons, described in this Dictionary, p. 1540, is a step in this direction ; 654 FOUNDING. and another is the process introduced by John Downie for moulding pipes and hollow cast ware, andapplicable to a wide range of articles, generally of cylindrical or spherical form. The apparatus employed for this purpose, Figs. 1336 to 1340, is here arranged for moulding a29-in. socket pipe. The moulding table E has two edges S S of its face, shown dotted, shaped so as exactly to fitthe pattern T, when the latter is raised with its axis level with the edges S, as in Fig. 1339. The 1336. pattern is fitted with a cam or collar U, at each end of which the portion from V to X is concentricwith the axis of the pattern, and the remainder eccentric. The cam U rests upon the adjustablebearing Y, and the axis of the pattern is guided by vertical slots in the ends of the moulding causing the pattern to rotate, the eccentric portion of the cam, acting on the bearing Y, graduallyraises the pattern till it bears on the point V of the cam, when the pattern is in its highest position,with its centre line level with the edges S of the moulding table, as in Fig. 1339. The flask Z isthen placed on the table and rammed up so as to form one half of the mould, and the two faces S S 1339. 1340.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
