Raymond, William Galt, 1859-1926, Raymond, William Galt, 1859-1926. cre · New York, J. Wiley & sons, inc · leaf 58
base of the thread. Screw spikes hold better and longer than ordinary track spikes, requiring less frequent respiking. Their holding power is from two to five times that of the ordinary spike, the greatest advantage being in soft woods, and the least in oak, or other hard woods. They do not tear… … Fig. 12
Railroad engineering
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