The principles of pattern making, written specially for apprentices and students in technical schools (1900)
Horner, Joseph Gregory, 1847-1927 · London, New York, Pitman · leaf 33
the position B, and the drag or bottom part is 22 PRINCIPLES OF PATTERN MAKING. represented by C. The pattern is withdrawn verticallyin the direction of the arrow. Clearly, now, the maincondition of delivery of the pattern from the sand, isthat the lowermost portions in C shall be a littlesmaller,… … B8 Fig. 5. Casting of a Single Bracket. cross section taken at a-a across the middle of thebracket. As the pattern is being lifted from theenclosing sand, the thinner, lowermost portions of thesewebs become disengaged from the flanking sand, anddo not drag against, and tear it up. The amount ofthis…
Patternmaking
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