. Brake tests; a report of a series of road tests of brakes on passenger equipment cars made at Absecon, New Jersey, in 1913 . Fig. 156. BEARING AREA AND COEFFICIENT OF FRICTION. 259 Sheet No. M. p. 47e D Pennsylvanja Railroad Company PHZLASElfHlA. BaLTDIOBX & WaSHINOTOH RaILBOAD COKPAJVT NORTHXBH CSNTRAL RaILWAT CoMPANT WSeT JSB«ET & SBAeHOKB ; COXPAMT TEST DEPARTMENT B/f/iff£ rsjrj Altoona, «;y. Fig. SHOE TEMPERATURE. 260 pass off with the sparks, a proportional amount will produce a rise inthe temperature of the shoe as a whole. 5
. Brake tests; a report of a series of road tests of brakes on passenger equipment cars made at Absecon, New Jersey, in 1913 . Fig. 156. BEARING AREA AND COEFFICIENT OF FRICTION. 259 Sheet No. M. p. 47e D Pennsylvanja Railroad Company PHZLASElfHlA. BaLTDIOBX & WaSHINOTOH RaILBOAD COKPAJVT NORTHXBH CSNTRAL RaILWAT CoMPANT WSeT JSB«ET & SBAeHOKB ; COXPAMT TEST DEPARTMENT B/f/iff£ rsjrj Altoona, «;y. Fig. SHOE TEMPERATURE. 260 pass off with the sparks, a proportional amount will produce a rise inthe temperature of the shoe as a whole. 506. However, it is not reasonable to look for evidences of theeffect of the temperature of the whole brake shoe on the coefficient offriction, when it is appreciated that the temperatures at the workingsurfaces greatly exceed the maximum temperatures ever reached bythe shoe as a whole. Consequently for a correct understanding ofthe relation between temperature and coefficient of friction it is neces-sary to examine minutely the phenomena which occur during thedevelopment of brake shoe friction and to study the action of thematerials immediately concerned in this process. 507. To illustrate how the slight inequalities of the two surfacesin contact interlock and resist relative movement, the following sketchhas been made to an enlarged scale.
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Keywords: ., bookcentury1900, bookdecade1910, bookidbraketestsre, bookyear1913
