802 PROF. A. H. GIBSON ON THE LOSS OF ENERGY AT OBLIQUE IMPACT 
Tasie I. 
~ Ratio of Areas of Outlet and Inlet Legs. 
6. 
1 9 3 4 5 
90° 1:53 97 915 921 925 
60° 71 59 70 75 79 
45° 44 45 -60 68 73% | 
30° 22 35 53 62% 68% 
15° 060 28 -48 58* -652* 
5° 0084 “254 AAT 566% | 642% 
0° 0 ‘250 Add 563 | 64 
* Obtained by extrapolation. 
The values of F corresponding to @=0° are calculated on the assumption that the 
loss is then due to a sudden enlargement of section from initial to final area. | 
After trying various systems of graphical representation it was found that for 
any pipe, on plotting the logarithms of the excess of the loss occurring with 
any angle @ over the loss when 6=0, on a base representing the logarithms of 8, 
the plotted points le sensibly on straight lines similar to A A’ (fig. 2), from which 
the following values of F are deduced :—- 
net aag | Yoseore 
1:1 0004606" 
2:1 25 + 0002286" 
3:1 444 + 0001546" 
Ma 63 + 0001156" 
ee | 64 + 000926" 
Here 4 is measured in degrees. 
Calling m the ratio of areas of outlet and inlet legs, the loss of head when @=0 is 
m1 
m 
2 2 
given by ( ) 39 eet Furthermore, the numerical coefficients of 6"* in the above 
