Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 554
put in; it also stays the tendency to any general movement. The new poling-board being inserted, it is driven ahead six or twelve inches, and then tem- ENGINEERIXG DRAWING. 537 … Fig. 127 (Section of Fig. 1281, through A B, looking west.) HOOSAC TUNNEL. Timbering and arching through soft ground at the West End. Scale, 10 = 1.
Mechanical drawing
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