Dingey, Peter Spear. [from old catalog] · New York, J. Wiley & sons · leaf 137
Fig. 153, … Fig. 156. PATTERN MAKING, yg BUILDING UP SPUR GEAR PINIONS. If spur gear pinion patterns, with about y face andupwards, were built up hollow, with a cover on the copeside, which could be removed as shown in Figs. 153 and154, the moulder would be more likely to get a castinglike the pattern. By…
Patternmaking
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