. The Street railway journal . SIDE ELEVATION END Street IIG. i.—DETAILS OF THE SPECIAL STREET BOX TO BE USEDALONGSIDE OF TRACKS IN THE STREET TO RECEIVEAND PROTECT AIR DELIVERY HOSE strength of 60,000 lbs. per square inch. As may easily lie fig-ured, this will provide an ample margin of safety ; the workingstrain due to longitudinal stress was found by the formula,radius X pressure per square inch — to be 7200 lbs. per square thickness AIR-COMPRESSORS TO BE USED IN THE COMPRESSOR PLANTS square inch, the combined effect of these two stresses thusamounting to 10,800 lbs. From this it
. The Street railway journal . SIDE ELEVATION END Street IIG. i.—DETAILS OF THE SPECIAL STREET BOX TO BE USEDALONGSIDE OF TRACKS IN THE STREET TO RECEIVEAND PROTECT AIR DELIVERY HOSE strength of 60,000 lbs. per square inch. As may easily lie fig-ured, this will provide an ample margin of safety ; the workingstrain due to longitudinal stress was found by the formula,radius X pressure per square inch — to be 7200 lbs. per square thickness AIR-COMPRESSORS TO BE USED IN THE COMPRESSOR PLANTS square inch, the combined effect of these two stresses thusamounting to 10,800 lbs. From this it may be observed that thefactor of safety amounts to nearly 6. In calculating the amount of air to be used in charging pass-ing cars, and thus the required capacity of the air compressorsand station storage tanks, it was assumed that the minimumpossible headway upon which cars would ever lie expected tooperate would be 2 minutes; inasmuch as the average headwayupon these lines is about 5 minutes, it may be seen that thisas
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
