. Prove di frenatura; un rapporto di una serie di prove su strada dei freni sulle automobili di equipaggiamento del passeggero fatte ad Absecon, New Jersey, in 1913. Ng delle ganasce di frenodella macchina di freno n°3 a chiusura con acqua è la differenza principale a benoted. Prove di laboratorio hanno dimostrato che la differenza di condizionamentodelle ganasce del freno, quando raffreddate sia con acqua che con aria, non ha alcun effetto apprezzabile sul coefficiente di attrito e sui conseguenti arresti, è tuttavia prob-abile, che quando l'acqua ha raffreddato l'orditura della scarpa wouldend, se nulla, a compromettere la zona di cuscinetto e di conseguenza un longerstop potrebbe essere previsto. Così,

• Collaboratore: Reading Room 2020
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. Brake tests; a report of a series of road tests of brakes on passenger equipment cars made at Absecon, New Jersey, in 1913 . ng of the brake shoesof the No. 3 clasp brake car with water is the chief difference to benoted. Laboratory tests showed that the difference in the conditionof the brake shoes, when cooled either by water or air has no appreciableeffect on the coefficient of friction and the consequent stops, it is prob-able, however, that when water cooled the warping of the shoe wouldtend, if anything, to impair the bearing area and consequently a longerstop might be expected. Thus, while a comparison between the stopswith the No. 2 and No. 3 brakes may be unfair to the latter, it is feltthat for practical purposes the comparisons made would not be mater-ially affected, had the shoes on both cars received the same coolingtreatment. 196 M. p. 47« D PENNSYLVANIA RAILROAD COMPANY Phil^dhjvia^ Baltoiom A WAtnnmron Bailsoao Cospavt NOItTBBBM CXNTBAL RaILWAT COKTAJTrWbST JmMMUT a SKAflBOBB RaH-BOAO CoHTAIIT TEST DEPARTMENT Shckt No.:7..9.5<^ .^^^/a:.rSi£rs.-w, u...<i/^SL/LS. Altoona. PA.©-??^rJ5». Fig. 115. STOP DISTANCE—SINGLE CARS. No. 2 AND No. 3 CLASP BRAKE. The variation between the best and the average stops is due largely to shoe cond ition. 197 402. As an example of the allowance that should be made for brak-ing power, suppose that the curves of Fig. 115 are to be used in compar-ing the best performance of the two types of rigging tested, using plainbrake shoes. It would be natural to assume that the distance betweenthe curves for the best stops of the No. 2 and No. 3 clasp brakes atany given per cent, braking power would indicate the difference instopping distance which resulted from the different characteristics ofthe two types of brake rigging. Thus, the difference in the best per-formance of the two types of rigging at 150 per cent, braking powermight be taken from Fig. 115 to be 965 feet—875 feet or 90 feet.But this is not a fair compar

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• bookcentury1900
• bookdecade1910
• bookidbraketestsre
• bookyear1913