. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . 61197210183174 Cubic feet waterper minntu. 1,2072,1242,,960 Horse-power. 34-265-595- 115- 119-6 The Risdon FlG -The foregoing figures are taken from the published catalogues ofthe wheels, and are probably closely correct, althoughthere is a discrepancy in the velocities. The inimrdportion of the discharge has been practically abandoned,the buckets being closed down to the bottom on acentral core, an
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . 61197210183174 Cubic feet waterper minntu. 1,2072,1242,,960 Horse-power. 34-265-595- 115- 119-6 The Risdon FlG -The foregoing figures are taken from the published catalogues ofthe wheels, and are probably closely correct, althoughthere is a discrepancy in the velocities. The inimrdportion of the discharge has been practically abandoned,the buckets being closed down to the bottom on acentral core, and so curved as to throw the water outfrom the centre, as shown in Fig. 1 of the Risdon or double capacity wheel mentioned form of bucket appears to take advantage of thecentrifugal motion given to the water by the wheel it-self, and which in the case of the (original) inward dis-charge was directly opposed to the effect of the water. Another cause of the displacement of the outward discharge wheel was the very poor result obtained at part gate, or when the water was cut off by a sharp Risdon wiaeel. edged cylinder, or register, gate. Placing the gates. 892 WATEE WHEELS. extemally has enabled them to be so formed as to deliver the water in an unbroken volume,by ajutages which contract the flow, instead of cutting it partially off. Thus, while the Boyden dropped from an efficiency of 7!) per cent, at full gate to 44percent, with lia|f water ; and the Houston from 81 ))ercent. to 33 per cent. ; the Risdon falls from 87 per cent, to 70 per cent., and the Hercules from 87 per cent, to 74 percent., in Professor Thurstons best test. The Kisdon wheels at the Jefferson mill of theAmoskeag Manufacturing Co., Manchester, N. H., consist of two pairs of 43-in., and oneI)air of 36-in, D. C, as shown in cut of bucket, and are all mounted on a 9-in, steel
Size: 1728px × 1446px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
