Modern moulding and pattern-making : a practical treatise upon pattern-shop and foundry work, embracing the moulding of pulleys, spur gears, worm gears, balance-wheels, stationary-engine and locomotive cylinders, globe valves, tool work, mining machinery, screw-propellers, pattern-shop machinery, and the latest improvements in English and American cupolas ... (1907)
Mullin, Joseph P · New York : D. Van Nostrand · leaf 188
ENGLISH AKD AMERltlAN CUPOLA-PRACTICE. 165 or less during the working to direct the blast more on one side than the other if necessary, or may be shut
Founding · Patternmaking
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
