MODERN STEAM PRACTICE . 548 exposed to the full boiler pressure , are not of sufficient strength to resist the stress ; and as the strain is in opposite directions , screwed stays are introduced , binding the inside and outside shells together . These stays are generally made of copper , and are… … reception , their ends are rivetted over , thus materially increasing their holding power . They are screwed for their entire length ; when so made it necessarily talees a long time to screw them into the plates . The stays are sometimes turned down at the middle ( Fig . 397 ) , making their…
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