Ripper, William, 1853-1937 · London, New York [etc.] : Longmans, Green and co. · leaf 111
r andloosen the screw be-neath the piston, whichliberates the pistonfrom the piston-rod.Then unscrew the pis-ton from the spring,and the spring fromthe cover. Proceed inthe reverse order to fixanother spring. Selection of Springfor Indicator.—Springsare made of variousstrengths to suit thepressure… … THE INDICATOR. 95 spring gives a reading of 1 lb. per square inch pressure for every —2in. vertical movement of the indicator pencil. The strength of the spring chosen depends upon the height ofdiagram required, which might be 2^ to 3 in. for slow speeds tonot more than half that height for high…
Steam-engines
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