. Journal of electricity, power, and gas . than three yearsgood experience in general land and topographic sur-veying and in addition thereto a good general educa-tion. The determination of the discharge capacity oftangential impulse water wheels is intimately con-nected with the question of the maximum streamwhich should be applied to a wheel of certain dimen-sions. In the case of many of the larger units thespeed of the wheel is determined by the requirementsof the machine to which it is directly connected, and,as the head is also usually fixed in any particular case,the diameter of the whee
. Journal of electricity, power, and gas . than three yearsgood experience in general land and topographic sur-veying and in addition thereto a good general educa-tion. The determination of the discharge capacity oftangential impulse water wheels is intimately con-nected with the question of the maximum streamwhich should be applied to a wheel of certain dimen-sions. In the case of many of the larger units thespeed of the wheel is determined by the requirementsof the machine to which it is directly connected, and,as the head is also usually fixed in any particular case,the diameter of the wheel is predetermined by con-ditions over which the manufacturer has little or nocontrol. It then becomes his duty to provide the powercalled for whether the conditions are as favorable ashe would like or not. There are too many conditions attending thepassage of the buckets through the stream which havenot yet been worked out to make it possible to provideexact formulae, and the following are given as approxi-mations to assist in design. t. Fig. 1. Fig. I is a diagram of a wheel of the followingdimensions: Pitch diameter , 72 Outside diameter ?. .86 Diameter at inner end of bucivets 62 Diameter of small jet 4 Diameter of large jet 6 Number of buckets 22 in. Velocity of pitch line relative to spouting velocity An article published in the Journal of Electricity,Power and Gas, December 25, 1909, explained amethod of determining stream paths and points ofdischarge of the water. Applying that method toFig. I, the line GG locates the commencement ofdischarge for the 4-in. stream from a bucket of properwidth, and HH the final; while FF and UU showsimilar points for the 6-in. stream from its widerbucket. It will be seen that while the wheel travels fromJ to K the bucket is discharging the full 4-in. stream,and similar lines drawn through the lower F and upperU will show a shorter arc, located further along in thedirection of motion, for the full 6-in. stream discharge. The length (S
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Keywords: ., bookcentury1800, bookdecade1890, bookidjo, booksubjectelectricity
