Electrical news and engineering . and the fact that two ofthe plants at Niagara Falls had reached their capacity, work-was commenced in March, 1918. on an extension to theHydro-electric plant of the Ontario Power Co., at NiagaraFalls, Ontario. Completion of the work within twelve monthsafter it was started not only adds from 40,000 to 50,000 horse-power to the plant, but also constitutes a fine record for theengineers entrusted with the work. Although the demandfor energy created by the war emergency has ceased to ex- foot diameter penstocks and two 20,000 horse-power tur-bines with direc
Electrical news and engineering . and the fact that two ofthe plants at Niagara Falls had reached their capacity, work-was commenced in March, 1918. on an extension to theHydro-electric plant of the Ontario Power Co., at NiagaraFalls, Ontario. Completion of the work within twelve monthsafter it was started not only adds from 40,000 to 50,000 horse-power to the plant, but also constitutes a fine record for theengineers entrusted with the work. Although the demandfor energy created by the war emergency has ceased to ex- foot diameter penstocks and two 20,000 horse-power tur-bines with direct connected generators, also the erection ofthe additional power house to house these units. One of the Largest Wood Stave Pipes Ever BuiltUnique features about this extension are the wood stavepipe, which is one of the largest ever built, the differentialsurge tank which has the largest diameter and has also thegreatest height of any similar tank not equipped with an aux-iliary spillway, and the power house were de-. Section through pov of No. 16 penstock ist, the demand created by the large number of new industries attracted by the power facilitie offered by the Hydro-Electric Power Commission, has alreadj appropriated a largepart of the additional outpul provided by the new unit. The construction of this extension involved the excavaHon of yards of earth and I t,000 yards of rock to per-mit the placing and ere >o) diameter woodJtave pipe 6,700 feet long di meter steel distribut-or feet long, lifferi ntial surge tank 94 feet high, four Johnson hydraulic operated valve-, two signed to withstand a pressure due to a -to foot rise in tailwaterelevation, this extraordinary condition having occurred in theyear 1909 ill. original plant of the Ontario Power Company as con-trolled and operated bj thi Hydro Electric Power Commis-sion, consisted of an installation of fourteen turbines, sevenwith a rated capacitj > 11,800 horse-power, five rated at
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