International Correspondence Schools · Scranton, Pa. : The Colliery engineer co. · leaf 645
plans the various types of trestles in general use,whose efficiency has been proved by long service. ^ m Cl4? PFf^ Al- ff £: m H_K.t W^M M 9 < STANDARD SI1>JGLE.TRACK PILE TRESTLE. 1 789. In Fig. 632 is given a plan of a pile trestle suit-able for heights of from 6 to 20 feet. On roads with… … FlG. 682. having at the cut-off point a diameter of not less than12 inches, inside of bark measurement. It is customary to notch down the caps 1 inch on the pileheads. The main object for this notching is to hold thepiles in place while they are being drift-bolted, in case theyhave been sprung in…
Railroad engineering
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