. Engineering and Contracting . i 1 ^ « Fig. 6—Productive Efficiency,figures at the left of the drawing. The scale of percentagesshould have started at 40 and all text references were madeon that basis. On page 402 of last weeks issue the valueof K is given as I. whereas it should read V^. On page column and 17th line, the per cent should be 22per cent. The corrected diagram is reprinted herewith. Spring Conference of Engineering Section of NationalSafety Council,— A number of engineosr who are foremost inaccident prevention work and in engineering education areon the program of


. Engineering and Contracting . i 1 ^ « Fig. 6—Productive Efficiency,figures at the left of the drawing. The scale of percentagesshould have started at 40 and all text references were madeon that basis. On page 402 of last weeks issue the valueof K is given as I. whereas it should read V^. On page column and 17th line, the per cent should be 22per cent. The corrected diagram is reprinted herewith. Spring Conference of Engineering Section of NationalSafety Council,— A number of engineosr who are foremost inaccident prevention work and in engineering education areon the program of the first spring meeting of the EngineeringSection, National Safety Council, to be held in the Engineer-ing Societies Building in New York City on April 27. Therelation between safety and engineering and the engineersplaco in the modern industrial world will constitute the motifof the entire program. C. P. Tolman. Chairman, Manufactur-ing Committee, National Lead Co., and Chairman of the Engi-neering Section, will Section of Siphon Spillway Indicating General Design of Units. selmo, Fairfax, San Quentiu, Ross, Kentfield and Sausalito,all within the Marin Municipal Water District. A preliminary description of this project was published inEnpineering and Contractin?. of Dec. 22, 1915. The dam was completed during the latter part of 191S. Itis a concrete structure, of gravity section, curved in plan,320 ft. long, at the crest, and 100 ft. high, with a roadwayon top. carrying the county highway across the canon


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