Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 451
<1.?.- 4; v_/r … #^ Fig. 1037. ENGINEERING DRAWING. 435 this point, and necessarily an inconvenience in the change of movement of ma-terial and workmen, but in later constructions this is avoided. Fig. 1034 is a recent plan and section of a main shaft, through which accessto the caisson is obtained by the workmen ;…
Mechanical drawing
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