.... The detailed description of the survey work may conveniently be divided into four sections, even though in practice some of these sections tended to merge, namely, the triangulation, the underground work, the precise alignment down shafts, and themiscellaneouswork. TRIANGULATION. It was first proposed to make...

... BENDS PRESSURE EARTH JOINTS DEFECTS PIPES AIR VALVES SLUICES WATER HAMMER FROST EARTHQUAKES LIGHTNING TUBERCULATION METHODS TREATMENT ATMOSPHERIC UNDERWATER TRAMWAYS RAILWAYS UNDERGROUND ELAN VALLEY BIRMINGHAM KEIGHLEY NEW YORK FLORIDA WAKEFIELD PROVIDENCE HARRISBURG...