Hawkins, N. (Nehemiah), 1833- · New York : Theo. Audel · leaf 46
fromrules, measures, and the lightof day, would gtiide the work-men at every step; but to beginsuch a work at the top, andconstruct it downwards by ex-cavation alone, in the darkbowels of the earth, is a morearduous undertaking, especially as deviations from the correct lines could not be remedied;… … 4S Pumps and HydrauLtcs.
Hydraulic machinery · Pumping machinery
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
