. The Street railway journal . ositions of materialsand supplies. The method of using this system of standard drawings andspecifications may be illustrated by citing the single example ofrail spikes. In order to meet the special requirements of trackconstruction in Philadelphia, the engineers of the way department,after considerable study and experiment, have designed a specialform of rail spike and this form in varying sizes has been adoptedas standard in all track construction involving wooden ties. Thedrawing for a spike Yl in- x Yl m- x 5 ins. is reproduced here-with, and not only shows th
. The Street railway journal . ositions of materialsand supplies. The method of using this system of standard drawings andspecifications may be illustrated by citing the single example ofrail spikes. In order to meet the special requirements of trackconstruction in Philadelphia, the engineers of the way department,after considerable study and experiment, have designed a specialform of rail spike and this form in varying sizes has been adoptedas standard in all track construction involving wooden ties. Thedrawing for a spike Yl in- x Yl m- x 5 ins. is reproduced here-with, and not only shows the novel design of the spike but alsoserves to illustrate the method of reducing the standards to draw-ings. Attention is called to the fact that in this form of spike theangle under the nose is exactly the same as the angle of foot ofrail, thus giving the maximum bearing for the spike against the angle is about 10 degs., as compared with from 23 degs. to25 degs., as found in the usual spike bought in the open market,. PHI Street Ity. Journal LADELPHIA RAPID TRANSIT STANDARD HOOK-HEAD SPIKE and which gives contact for only a portion of the surface under thenose. Another feature of the P. R. T. standard spike is thecurved bevel in front of the point. The reason for this is thatwhen a spike is started under the tram of a rail it is impossible todrive the spike straight, for the tram of the rail prevents the work-man from delivering a straight down blow. On this account itis necesary to start the spike at an angle to the web and the curvedsurface or bevel mentioned is designed with the idea ofcausing the spike to straighten itself under the blows of the ham-mer, and in practice this object is fully accomplished. Further-more, in the back of the spike, at the head, there is a bulging orswelling of 3-32 in., designed as the result of observation to theeffect that while a spike is being driven it usually moves to andfrom the rail at each blow, thus making an enlarged hole in
Size: 2205px × 1133px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
