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 182
ENGLISH AND AMERICAN CUPOLA-PRACTICE. 159 with bolts and an asbestos ring ; and opposite each tuyere is provided a circular cover, which moves off and on, and when on is perfectly air-tight. These circular covers are provided with mica disks ; and'the respective areas of the three rows of tuyeres… … Fig. 163. Stewart's Patent Rapid Cupola: View of Lower Portion of Cupola enlarged to form Receiver. opening (shown in Fig. 162), fitted with a flap-door for the escape of the gases involved from the combustion of the coke. This arrangement is a most important one ; as it entirely obviates the…
Founding · Patternmaking
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
