Collins, A. Frederick (Archie Frederick), 1869- · Boston, Small, Maynard and company · leaf 134
ads throughthe steam dome outside is Vs inch in diameter andthe end of this pipe must be threaded. Cut out a disk % inch in diameter and Vs inchthick; drill a %2-inch hole through its center and Fittings for Model Engines 119 thread it to fit the pipe. Cut out another diskof the same thickness and… … SPRING PLUG P/5K3£/?T DISK Fig. 48. A Spring or Pop Safety Valve Fit both of these disks into one end of a pipeVie inch in diameter and % inch long with thevalve disk inside, and solder both of them in thepipe. Put the plug in the valve hole; form aspiral spring of brass wire and put it in the…
Steam-engines
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