. Railway maintenance engineering, with notes on construction . appreciable compression. The compression under the wheel is not entirely a case ofcubical compression and can be understood from the followingexplanation given by Professor Johnson.* * Paper contributed by Professor Johnson to the Engineers Club of^t. Louis^ December, 1892. 112 RAILWAY MAINTENANCE When a plain cylindrical column is subjected to a uniformpressure or stress over its entire cross-section, as Fig. 64A, it maybe said to be in a condition of free flow/^ since it is free tospread in all directions throughout the length o
. Railway maintenance engineering, with notes on construction . appreciable compression. The compression under the wheel is not entirely a case ofcubical compression and can be understood from the followingexplanation given by Professor Johnson.* * Paper contributed by Professor Johnson to the Engineers Club of^t. Louis^ December, 1892. 112 RAILWAY MAINTENANCE When a plain cylindrical column is subjected to a uniformpressure or stress over its entire cross-section, as Fig. 64A, it maybe said to be in a condition of free flow/^ since it is free tospread in all directions throughout the length of the Fig. 645 the material is compressed uniformly over a smallarea, as with a die. Here there is a flowing of the metal laterally,and then vertically, finding escape around the edges of the is a condition of confined or restricted flow, and evidently theelastic limit here will be much higher than with the simple column. In Fig. 64C, the surface is compressed by a cylinder, thegreatest distortion being at the middle of the area of
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