Continuation of the report of the Committee of the Franklin Institute of Pennsylvania, appointed May, 1829, to ascertain, by experiment, the value of the water as a moving power
1832
Journal of the Franklin Institute
Continued from p..~3.) . The table~ which follow, (viz. e and f,) exhibit the results of a series of exp~:timenls made with wheel No. lI~ to ascertain the different areas .f aperture, and quantities of water, required to raise a determinate wei~Zht lhrm~'.2h a given height in a determinate time, with a ht'ad and taI[ of lilteen feet, and of twelve feet, and with interme-dilt~e b¢'i~l~t~ .fwatev applied at the sameor at different points above th". b.tl.m .f the wheel. Thus to determine the
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... ative value ~)[ ~ater ~hen employed under the several circumstances embraced h~ l!m set-i~:s. "Vh¢ tw, chutes used will be designated as A and B. Each was t~(, il~cbcs in width by sixteen inches in breadth, and delivered the water in the same direction with regard to the periphery of the whe el. "1"~} each ot these chutes was applied the arrangement ofgates tigured .n Plate V. A gate capable of sliding upward is represented at ,. and at /~ a fal:e gate which could be drawn back until its front edge., ~a~ even with the back of the chute; beyond tbis position the ~at,: ~as l,rCwmtcd flom being drawn bye permanent stop. Between [h~ fi.~t mlge of the gale b and the face of a the water passed. -By m~,vin~ lhc gate b [i~rward, against a, the aperture was closed. ~-g'he gate a was tw(~'nty-two inches long, one inch and a fourth thick, and at a line eleven inches fi'om the upper end began to taper, terminating in an edge at the lower end. By h~werin~, or raising thisgate the aimr~m'e ~£~ diminished or ~ucreased. In°any position in Milch a was placed, the fMse gate b could be moved forward againstits face so as to c ~se the aperture. The false gate b was two inches thick, tim fi~ce being rounded so as to leave the smallest part of the open i ng at its lower edge, at which place the aperture was measured. "l-'hi~ liar was also taken as that from which to make the division into head and fall: when the gates a and b were applied at chute A, this lim~ was twelve feet above the bottom of the wheel, and nine feet ab,ve the same point when the gates were attached to chuteB. '['he gates just described having been adapted to chute A, the~ate a was opened so "is to give an area of aperture of fourteen inches; in this imsition it was secured by screws to prevent the possibility of wtriali~m in the aperture by a movement of the gate. 'I'l~e false ~,-a b having been also placed, the water in the forebay was raised t~'ti~ee height of three feet above the aperture, making a head anti f~ll of filtiien t~et. A series of experiments,were tl~en made to ascertain what velocity of the wheel ~vould give a maximum of efti~ct with the assumed area of aperture and head and fall, the weights being varied for this purpose. The result was, that the maximum etti~ct was obtained with ave-
doi:10.1016/s0016-0032(32)91652-4
fatcat:3bbhqpsn4rgybo6uwfag5sm3pi