The manual training school, comprising a full statement of its aims, methods, and results, with figured drawings of shop exercises in woods and metals (1887)
Woodward, C. M. (Calvin Milton), 1837-1914 · Boston, D.C. Heath · leaf 124
g of the word is also extended so as to include additions to the mold outside the space to be filled by the liquid where the core is to be supported, or where an additional cavity is required in order to make a small projection to the main body of the casting. Those exterior parts of the mold which… … is shown extending at top and bottom into the core-prints made foi it ; there is also an external core, <?, having a cavity in itself which is to contain a sort of horn to the main casting. If the pattern of the horn had been put on the main pattern it would have been impossible to get the pattern…
Manual training
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
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