Collins, A. Frederick (Archie Frederick), 1869- · Boston, Small, Maynard and company · leaf 123
an elbow screwed to the pipefor the pressure gauge and, finally, if you havea steam whistle, screw a coupling on the pipe inthe smoke-box sheet. Pipe /4 inch in diametercan be bought cut to any length up to 2 feet andthreaded on both ends, and the elbows and coup-lings are tapped with… … Fig. 43. The Boiler Complete108 Making Small Boilers 109 until the pressure gauge indicates twice the num-ber of pounds pressure that you ever intend toget up in steam. The boilers described in thischapter should be tested to 40 or 50 pounds pres-sure ; consequently you should never let the…
Steam-engines
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