. Railroad construction. Theory and practice . ^ made on the principle illus-trated in Fig. 171. The problem is to preserve the distancebetween a and d constant regardless of the temperature. Placethe compensator half-way between a and d, or so that ab= fall of temperature contracts ab to ab\ Gloving b to y willcause c to move to c, in which bb^ =cc\ But cd has also short-eiied to cd; therefore d remains fixed in position. To avoid 332 RAILROAD CONSTRUCTION. § too great angular motion, one such compensator should be usedfor each 500 feet. If a line 1000 feet long is to be providedfor
. Railroad construction. Theory and practice . ^ made on the principle illus-trated in Fig. 171. The problem is to preserve the distancebetween a and d constant regardless of the temperature. Placethe compensator half-way between a and d, or so that ab= fall of temperature contracts ab to ab\ Gloving b to y willcause c to move to c, in which bb^ =cc\ But cd has also short-eiied to cd; therefore d remains fixed in position. To avoid 332 RAILROAD CONSTRUCTION. § too great angular motion, one such compensator should be usedfor each 500 feet. If a line 1000 feet long is to be providedfor, two compensators would be used, 250 feet from each that in operating through a compensator the directionof motion changes; , if a moves to the right, d moves to theleft, or if there is compression in ah there is tension in cd, and.
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