. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. tongs, and emptied in the following way:— The mould or form for casting sheet brass consists of two slabs of granite, a a, figs164, 165. They are 5| feet long, 3 feet broad, 1 foot thick, and, for greater security,girt with iron bands, 6 b, 2 inches broad, 1| thick, and joined at the four corners withbolts and nuts. The mould rests upon an oaken block, c, 3| feet long, 21 broad, and Ifthick, which is suspended at each end upon gudgeons, in bearing blocks, placed under thefoundry flo
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. tongs, and emptied in the following way:— The mould or form for casting sheet brass consists of two slabs of granite, a a, figs164, 165. They are 5| feet long, 3 feet broad, 1 foot thick, and, for greater security,girt with iron bands, 6 b, 2 inches broad, 1| thick, and joined at the four corners withbolts and nuts. The mould rests upon an oaken block, c, 3| feet long, 21 broad, and Ifthick, which is suspended at each end upon gudgeons, in bearing blocks, placed under thefoundry floor, d d, in the casting pit, e e. This is lined with bricks ; and is 6| feet long,5| broad, and 2 deep; upon the two long side walls of the pit, the bearing blocks arelaid, which support the gudgeons. The swing-blocks are 10 inches long, 18 inchesbroad, 15 inches thick, and are somewhat rounded upon their back edge, so that thecasting frame may slope a little to the horizon. To these blocks two cross wooden arms,//, are mortised, upon which the under slab rests freely, but so as to project about 5 inches. 174 BRASS, backwards over the block, to secure an equipoise in the act of casting, g g are bar*placed at both of the long sides, and one of the ends, between the slabs, to determine the
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
