The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . dred and fifty revolutions a minute, giving it a periph-eral velocity of a hundred and twenty miles an hour. Ifit ran without load it could be speeded to just double thesefigures, giving the rim a speed of twenty-one thousand sixhundred and eight feet per minute, or two hundred andforty miles an hour. With a half-inch stream of water itdevelops one hundred horse-power. This wheel has runseveral years under these conditions without any cost forrepairs. The Hydraulic Power Company, of Ch
The wonders of modern mechanismA résumé of recent progress in mechanical, physical, and engineering science . dred and fifty revolutions a minute, giving it a periph-eral velocity of a hundred and twenty miles an hour. Ifit ran without load it could be speeded to just double thesefigures, giving the rim a speed of twenty-one thousand sixhundred and eight feet per minute, or two hundred andforty miles an hour. With a half-inch stream of water itdevelops one hundred horse-power. This wheel has runseveral years under these conditions without any cost forrepairs. The Hydraulic Power Company, of Chester, England,run wheels under nearly as severe pressures. They have 23* 284 WONDERS OF MODERN MECHANISM. ail eigliteen-inch wheel, weighing but thirty pounds, thatgives twenty-one horse-power with a (juarter-inch Pelton wheels are also built for use in cities asmotors, having for this purpose an iron case, with a pipebringing in water from the mains. They are very desirableMhere the pressure is high, and may be conveniently con-nected with a dynamo, as shown in the illustration. The Fig. THE PELTON MOTOR WITH DYNAMO CONNECTED. wheel, under these circumstances, is made of a diameter togive proper speed to the dynamo under tlie water-headavailable. Where a considerable head of water is obtain-able, a small stream may be used to run an electric lightingplant at small cost. The water being free, the only chargeis for interest, repairs, and attendance. Right in line with this discovery of the virtues of thesimple form of water-wheel here described comes an inven-tion for using steam in the same manner. No doubt theiirst endeavor to use steam was by allowing it to blowa draft in a rotating fan or wheel of some sort, but the ILLUMINATING GAS. 285 power thus developed in the early experiments did notcompare with that obtained by using steam under pressuretiirough the medium of a cylinder, as in the 1890, Dr. Gustaf de Laval made a little wheel design
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