808 PROF. A. H. GIBSON ON THE LOSS OF ENERGY AT OBLIQUE IMPACT 
foot-lbs. per lb, of (2). 
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2g 
m4 
2g" 
a 
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tS 
Value of b in formula Loss 
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Fic, 5.—Ratio of Areas of Primary and Impinging Streams. 
i.g= if 0—30 sand‘O)— 20) hi... 1 — 2, 
Vo" Voz 
Ii m=1°5, a= 34, b=-24, loss = ("603 + °24)2 = 843 2 
2g 2g 
2 2 
Ifm=1-75, a='25,6=:30,° loss=(:326 +°30)2 = -626 22. 
29 29 
= Vo" Vo" 
If m=2:°0, a= 20) b="30, loss = ("200 + 35) 2 = °550 2 
29 29 
2 2 
If m=225, a='17,b0="40,  loss=("135+°40)2 = "535 22 
2g 2g 
V2 Voz 
lf m=2°5, a="15, b="44, loss = (096 + °44)2 = 536 2 
29 2g 
Vo" Vo" 
If m=3-0, a='12,b="52, loss = ("053 + °52)-2 = 573 2 
29g 29 
On plotting these values of m against the loss, it appears that the minimum loss 
2 
occurs when m= 2°3, and amounts to 5825) foot-lbs. per lb. of stream (2). 
To facilitate the solution of practical problems the range of values of 6 from 0° to 
45°, and of m from 1 to 6 has been examined in this way. As a result it appears that 
the value of m for minimum loss is given with a close degree of accuracy by the 
relationship 
DOr ex [Oge'® 
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