. Electrical world. essity of a coffer-dam below thefalls was avoided. The entire masonry structure was of concrete composed of Portlandcement, sand and crushed stone in the proportions of i, 2 and 5. Thecement was of Canadian manufacture, and suitable sand and stonewere obtained on the ground. The concrete was mixed by a Jeffreyspiral mixer. As the necessity for early completion required that much of themasonry be put in place during the cold winter months, a temporarybuilding framed of rough poles and sheathed with inch boards cov-ered with tar paper was constructed over the entire work, and
. Electrical world. essity of a coffer-dam below thefalls was avoided. The entire masonry structure was of concrete composed of Portlandcement, sand and crushed stone in the proportions of i, 2 and 5. Thecement was of Canadian manufacture, and suitable sand and stonewere obtained on the ground. The concrete was mixed by a Jeffreyspiral mixer. As the necessity for early completion required that much of themasonry be put in place during the cold winter months, a temporarybuilding framed of rough poles and sheathed with inch boards cov-ered with tar paper was constructed over the entire work, and theinterior was kept heated with stoves and steam coils to a temperatureof not less than 40° F. day and night until completion. In this waythe progress of the work was rendered independent of weather con-ditions. The power house was constructed with concrete walls and a wood-sheathed felt roof supported on steel trusses. The general arrange-ment may be seen from the ground plan and section elevation -^UoveLine. / ( M ^1 Is
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
