Water-power; an outline of the development and application of the energy of flowing water . (9 86 CONSTRUCTIOM OF DAMS. what is common in ship-building, and by steaming the plankall difficulty would disappear. Below the inflection-point ofthe curved face there would be no harm in applying a protec-tion of iron, the wear on that portion being severe. Strips offlat iron 3 inches wide and 6 or 8 inches apart would be asgood as continuous plates. It will be noticed in Fig. 43 thatwe have adopted a curve which leaves some 16 feet of theapron straight and level. Had we placed the tangent-point atthe
Water-power; an outline of the development and application of the energy of flowing water . (9 86 CONSTRUCTIOM OF DAMS. what is common in ship-building, and by steaming the plankall difficulty would disappear. Below the inflection-point ofthe curved face there would be no harm in applying a protec-tion of iron, the wear on that portion being severe. Strips offlat iron 3 inches wide and 6 or 8 inches apart would be asgood as continuous plates. It will be noticed in Fig. 43 thatwe have adopted a curve which leaves some 16 feet of theapron straight and level. Had we placed the tangent-point atthe lower extremity of the apron, we should have had a curva-ture such that the deflection of a 16-foot plank would havebeen less than 6 inches. Fig. 44 is a section of the dam of the Wauregan Mills * of,the Ouinnebaug River at Plainfield, Conn. The river at this Fig. 44,. Fig. 44rt. point has a drainage-area of something over 500 square spillway is 350 feet long. The abutments are of rubble •Tenth U. S. Census Report, vol. xvi. Region Tributary to LongIsland Sound, p. 34. CRIB WORK. 87 masonry with dressed face, rising 10 feet above the cap of thedam, which is a cribwork of square and flatted timbers filledwith stone; the timbers being laid about 5 feet apart each wayand drift-bolted at their intersections. The cap of the dam isabout 17 feet above the apron. Two features of this dam areto be noticed: (i) The up-stream planking, which runs length-wise of the dam, contrary to the usual practice. This disposi-tion is secured by means of rafters running on the slant,notched and drift-bolted to the longitudinal timbers. (2) Thevery steep slope of the face, causing ice and floating bodies tostrike with great force upon the apron, which consists of squaretimbers laid in contact. The angle of incidence being toogreat to permit falling bodies to gla
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