. Railway mechanical engineer . proved bythe use of four-wheel trucks under, say, 08 per cent of theheavy passenger locomotive tenders in this country. Axle loads as high as 45,000 lb. are permitted on passengertenders, yet when we design a passenger car it is with fear andtrembling that we put 31,000 lb. on the same axle. In order to ascertain what effect on the trains resistance thetwo extra axles of the six-wheel truck would have we madethree round trips each, with a dynamometer car on a ten-cartrain, using four-wheel trucks, and a ten-car train using six-wheel trucks, the car bodies being
. Railway mechanical engineer . proved bythe use of four-wheel trucks under, say, 08 per cent of theheavy passenger locomotive tenders in this country. Axle loads as high as 45,000 lb. are permitted on passengertenders, yet when we design a passenger car it is with fear andtrembling that we put 31,000 lb. on the same axle. In order to ascertain what effect on the trains resistance thetwo extra axles of the six-wheel truck would have we madethree round trips each, with a dynamometer car on a ten-cartrain, using four-wheel trucks, and a ten-car train using six-wheel trucks, the car bodies being the same in both difference in total weight per car was due entirely to thedifference in weight of the trucks, the cars with six-wheel truckseach weighing 66 tons and those with four-wheel trucks weigh-ing 50 tons each. The tests indicated that the only materialdifference in resistance was due to the difference in weight ofthe vehicles. With the cars in question we would have the HI Iff—4-f iA \-~&p\~,l RpeTep. 2 Required 0neaf24^__ One at 12%_3_0 Fo^Carpefs_ A r 2 0For Seats Vacuum Tip. Aluminum. 2 Required. (Appro.) Hose 2 Required. Details of Canadian Northern Vacuum Cleaner for Coaches the collector body through a 3/16-in. opening in the special brassnozzle shown in detail in the illustration. In the outlet fromthe collector is placed a brass bushing with a V^-m. opening,the inner end of which is located about y2 in. in front of theend of the nozzle. As the small stream of air issuing from the nozzle passesthrough the bushing it produces an induced current in the suc-tion branch of the collector, which is connected to the vacuumtip. The air and dust which is thus drawn into the collectoris blown out through the delivery pipe. The vacuum tip is secured to a short section of one inchpipe, which is provided in two lengths, one for cleaning carpetsand the other for cleaning seats. In order to facilitate changingthe nozzles for the two classes of wor
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
