Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 459
izontal joints at the crest were run in with sulphur. The coping-stones were dowelled to the face and together, and clamped to an inclined stone 442 ENGINEERING DRAWING. on the lower slope ; the end-joint between these stones was broken by makingevery alternate lower stone longer, and the upper… … Fig. 1046. old dam had become very leaky and worn, and the overfall had in many placescut deep into the rock, and in some places within the line of the dam. It wastherefore proposed to make the new dam, as a roll to the old one, to dischargethe water as far from the foot of the dam as possible, and…
Mechanical drawing
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