Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 469
yinserting in the cope before filling it with sand a wooden pin, the extraction of which after the copeis filled leaves the gate. To enable the gases which are generated by the melted metal to escapegradually without causing an explosion, the sand is pierced by a piece of fine iron wire, leaving… … half of the latter lifting with the cope, while the other half remains in the nowel. To loosen thepattern in the mould, so that it shall not lift the sand when drawn therefrom, a piece of pointediron wire is lightly driven into the pattern and tapped laterally in two or more directions. Hence…
Mechanical engineering -- Dictionaries
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