Appletons' Cyclopaedia of Applied Mechanics; A Dictionary of Mechanical Engineering and the Mechanical Arts Volume 2

Appletons' Cyclopaedia of Applied Mechanics; A Dictionary of Mechanical Engineering and the Mechanical Arts Volume 2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1880 edition. Excerpt: ...of fruit-trees against walls j hence their name " wall" nails. Cast nails are also used for the attachment of laths to the interior walls of buildings to hold the plaster. These have tapering shanks, square or triangular in section, and are cast in moulds formed of sand, from patterns which represent the heads only, the shanks being pricked in with a model representing the spike in the corresponding half of the mould, directly opposite the centre of the head pattern; or a complete pattern of the nail is projected through a thin metal plate, the head on one side, the spike protruding on the other. These are moidded in a two-part casting-flask or mould, the head on one half, the stalk on the other. Sometimes the nail is laid in a longitudinal direction, one half on one side, the other half on the reverse of a thin metal plate, and then moulded. After the mould is made, the impressions produced by the patterns are connected to central "gets " or runners. The moulds, being closed, are bound together with ordinary moulder's clamps, so that the iron in a state of fusion is ran in and fills the prints made by the patterns. When cooled, the moulds are opened, and the nails disconnected or broken off from the " gets." Like all iron castings, these nails are brittle and frequently break in driving, which could only be obviated by annealing them in close iron boxes filled with hematite iron ore. This process, however, would be expensive, and even when annealed the nails would not be so well fitted for general use as hand-wrought, machine-made, or cut nails. Cast brass nails, with square or twisted shanks, are produced in small quantities for ship-building purposes, and of an alloy of copper and tin, chiefly used for the...
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Product details

  • Paperback | 632 pages
  • 189 x 246 x 32mm | 1,111g
  • United States
  • English
  • black & white illustrations
  • 1236776070
  • 9781236776075