. American engineer and railroad journal . us 3-32 in. Accordingly, we may infer thatthe first spring could not receive a total set greater thanminus 9-32 in., or that during the life of the spring, curve B(Fig. 5) would never fall below curve C. Accordingly, it is evident that 106,000 pounds per squareinch is allowable for the working fiber stress. The maximumallowable fiber stress can only be determined by more exhaus-tive experiments upon this subject. Since all springs are at times subjected to excessive pres-sures which tend to produce a deformation from which thespring can never recover,
. American engineer and railroad journal . us 3-32 in. Accordingly, we may infer thatthe first spring could not receive a total set greater thanminus 9-32 in., or that during the life of the spring, curve B(Fig. 5) would never fall below curve C. Accordingly, it is evident that 106,000 pounds per squareinch is allowable for the working fiber stress. The maximumallowable fiber stress can only be determined by more exhaus-tive experiments upon this subject. Since all springs are at times subjected to excessive pres-sures which tend to produce a deformation from which thespring can never recover, we would suggest that when platesprings are tested they shall first be given two applications ofthat load which would be equivalent to a fiber stress of 146,000pounds per square inch. Such a pressure to be quickly ap-plied and released, the object being to relieve the spring ofmost of its set while under the testing machine, and thus in-sure ourselves against the annoyance of having the springreceive any permanent set when under the o m 3 o ;EdJO a g uK t-l Hv <3 June, 1904. WIKKICAN HNGINEEB AND RAILROAD JOURNAL. 221 NEW MACHINE FOR CLEANING FLUES. NEW LOCOMOTIVE AND CAR SHOPS. Atchison, Topeka & Santa Fe Railway. McKees Rocks, Pa. The flues are I leaned in a concrete pit built under the floorthis road, was designed to clean a large number of flues at aclean them quickly and noiselessly and to reduce to thelowest terms the cost of handling In and out of the machine. The flues are cleaned in a concrete pit built under the floor ,ii the shop, ills being 1 ft. 8Vfs in. by 22 ft. by C ft. 8 in. deep, It is connected with the sewer and may be filled withwater to any desired depth. Flues while being cleaned aresuspended In the water by two specially wide-faced, ease hard-ened wrought iron chains forming continuous loops, in whichthe Hues roll over and over upon themselves as the chains aredriven at a speed of 130 ft. per minute by the gearingoverhead, to which a 20-ho
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
