. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. o is the loam board in its proper position for working, having its inneredge set parallel to the spindle, and to the diameter of the cylinder required, and simply fixed tothe arm at the top. A cylinder of brickwork p is first built up, being everywhere an inch or soclear of the board. A coat of loam is next laid on as usual, to fill up the clearance and completethe core. The board and the spindle being removed, the work is lifted away to the stove, on thecore ring a a, by the snugs upon its rim. The smalle
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. o is the loam board in its proper position for working, having its inneredge set parallel to the spindle, and to the diameter of the cylinder required, and simply fixed tothe arm at the top. A cylinder of brickwork p is first built up, being everywhere an inch or soclear of the board. A coat of loam is next laid on as usual, to fill up the clearance and completethe core. The board and the spindle being removed, the work is lifted away to the stove, on thecore ring a a, by the snugs upon its rim. The smaller cores, which are to form the steam passages, are for the supply passages a a, andthe exhaust passage 6. The two former being of the same shape, may be formed from one core box,seen in plan and section, Figs. 1334, 1335, for such kinds of cores are usually formed on three sides,and open on the fourth side to admit the material, which is shaped off on this side, by the edge ofa piece of wood cut to the contour of the core, and diawn along upon the sides of the core box as 1331. guides. The core for the exhaust passage is partly circular, and partly otherwise at the formation is thus more complicated. It is made in three parts; the centre part annular toembrace the cylinder, and formed by a loam board, and the terminations made in core boxes, andfitted to the other. Fig. 1333 is a vertical view of the method of making the annular core. It isbuilt upon a portable square table convenient for small circular work generally, as it may be con-veyed to the stove without the necessity of shifting the centre. The spindle turns by a conicalpivot on its under end, moving in a socket, which is the only staying it requires. A block a a isfirst prepared, being a plain built ring of which the exterior is smoothed with loam, and is madeexactly to the interior diameter of the core and to the same depth. The core, seen in section at 6,is run upon the outside of the block to the ne
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
