Science for beginners . Fig. 297.—Interior view of the power house at Keokuk showing the15 generators now installed, each of which produces 10,000 horse-powerof electrical energy. supply of water from a stream 2100 ft. above the wheel. Thediameter of the nozzle was but % in. and yet the wheel did 494 MACHINES, WORK, AND ENERGY 100 horse-power of work. The efficiency of impulse wheelsis frequently 80 or 90 per Fig. 298.—Vertical cross section of the turbine pit.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscience, bookyear1921