Raymond, William Galt, 1859-1926, Raymond, William Galt, 1859-1926. cre · New York, J. Wiley & sons, inc · leaf 344
withthe precision of a single straight Une. For projecting the lineacross the mountain, permanent piers should be established atintervals on the Hne, and centers determined on these piers byrepeated double centering with a large instrument. An ad-justable centering piece may be devised, sliding in… … Fig. 102 Gated in the sketch. Fig. 102. They make the projection of theline across the mountain easier and more certain than a linecarried up the steep, irregular sides above the ends of the tunnel.In any important work the station piers will be housed in. If thedistances are long, a large transit…
Railroad engineering
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