Water-power; an outline of the development and application of the energy of flowing water . ilding. The aboveare the main features of the establishment. Many modificationswould suggest themselves on a careful study such as woulddevolve upon an engineer charged with its construction. Testing Mechanism.—The power developed by a wheelundergoing a test is consumed in friction. A stout pulley B isattached to the shaft 5, and its velocity is controlled by abrake, a convenient form of which is shown at Fig. 250. Thisconsists of a hollow strap encircling the pulley and preventedfrom rotating by the ar
Water-power; an outline of the development and application of the energy of flowing water . ilding. The aboveare the main features of the establishment. Many modificationswould suggest themselves on a careful study such as woulddevolve upon an engineer charged with its construction. Testing Mechanism.—The power developed by a wheelundergoing a test is consumed in friction. A stout pulley B isattached to the shaft 5, and its velocity is controlled by abrake, a convenient form of which is shown at Fig. 250. Thisconsists of a hollow strap encircling the pulley and preventedfrom rotating by the arm l.^. The pressure necessary to beapplied to this arm to prevent the brake from rotating is acorrect measure of the effort exerted by the wheel, and thispressure combined with the velocity of the wheel correctlymeasures the power developed b\- the latter. The pressure of TES TING ME CHA NISM. ^37 the strap on the wheel is controlled by means of the hand-wheel Zi). This application of the power creates great heat. In fact,the whole energy of the wheel is developed in the form of heat,. SCALE OF FEET Fig. 250. at the rate of i unit of heat for every 772 foot-pounds ofenergy, so that a wheel of 500 horse-power would, in a run ofan hour, develop heat enough to raise 3 tons of iron to a whiteheat. To remove the heat as fast as it is generated and pre-vent the destruction of the apparatus, the hollow strap istraversed b\-a current <)f\\atcr entering through the flexiblepipe/and discharged through /,. I^igs. 250 and 251 relateto a vertical shaft in which the pressure exerted by the
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecthydraulicengineering
