. Railway mechanical engineer . . OZSa IN. PLAIN FIOURES--BOILER PRESSUREFIGURES wnHSYffBOLS-TINEAFTER LIGHTING FIRE RO LF QF «f«j- zo DUMPe ■ -- ;;: : ::-l--+ 1 ttf jtf \i\\\ ;::::::: - ::: :: v-vo:^- 41 iii/;;!//: :: :; alfc-i---, S \ :: : ; -.: -; ■.■ -V, ■ J ■ ■ ■ / ^-- —-1; :: - - 40 3-3oi- m :i; IICNTNO FIRE. MOVEMENT IN .OOI INCH. Staybolt No. 3 Top Row Back—Delaware & Hudson Locomotive built as to permit the sheets to expand under the influenceof temperature changes, will put less stress upon the stay-bolts and sheets than one where such freedom of motion doesn
. Railway mechanical engineer . . OZSa IN. PLAIN FIOURES--BOILER PRESSUREFIGURES wnHSYffBOLS-TINEAFTER LIGHTING FIRE RO LF QF «f«j- zo DUMPe ■ -- ;;: : ::-l--+ 1 ttf jtf \i\\\ ;::::::: - ::: :: v-vo:^- 41 iii/;;!//: :: :; alfc-i---, S \ :: : ; -.: -; ■.■ -V, ■ J ■ ■ ■ / ^-- —-1; :: - - 40 3-3oi- m :i; IICNTNO FIRE. MOVEMENT IN .OOI INCH. Staybolt No. 3 Top Row Back—Delaware & Hudson Locomotive built as to permit the sheets to expand under the influenceof temperature changes, will put less stress upon the stay-bolts and sheets than one where such freedom of motion doesnot exist. There is no reason to think that there was anygreat difference in the temperatures of the sheets of thetwo boilers, and yet, as I have already indicated, there was December, 1919 RAILWAY MECHANICAL ENGINEER 707 a marked difference in the movements of the staybolts andthe sheets. If a given change of temperature produces adefinite change of dimension in the sheet, anything that pre-vents this change must itself be subjected to stress and mustput a similar stress upon the sheets. Hence, so far as theseinvestigations have been carried, they indicate the valueof using the flexible in preference to the rigid bolt as a meansof reducing stresses in the firebox. There is one point that cannot be expressed in cold figures an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
