Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 271
account it wouldbe designated by the iron-founder a drawback, by the brass-founder a, false core. All the patterns in the mould, Fig. 789, could be extracted from each half of the mould, becausenone of them encroach beyond the perpendicular line, or that in which the mould is lifted; a and 6could… … in Fig. 790 being undercut, the division of the mould into two parts only would be impracticable, andfalse cores or subdivisions would be required in the manner represented, the construction of which willbe hereafter detailed. Extending these same views to a more complex object, such as a bust, it…
Mechanical engineering
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