BY MEANS OF A CURRENT METER. : 99 
If the meter wheels had been placed forward of the test position, I should expect the 
humps shown in the curves of Fig. 27 to occur at smaller values of E — H. 
The wake values for the above models were obtained by running the meter on the center 
line of the model and upon the left-hand side of the center line. The working platform is 
so located that this is the most convenient position. The wake values when off the center 
line would be different if measured by the same wheels upon the right-hand side of the 
models. 
In the case of Model 5 the meter was run in certain cases upon the right-hand side as 
well as upon the left-hand side, and the results are given below. 
Model 5, no bossing. 
Wheels out 2 ;% inches from center line. 
Draught of model equals 7.07 inches. 
Wheels up from the keel 234 inches. 
| Left side......... 18.3% 20.6% 22% | 
Right side....... 18.3% 21.7% 25% 
Wheel up from keel, 3% inches: 
334” diam. | 
eftasidesrerereeae 32.7% 
Right side.......... 29.3% 
The meter wheels were right-handed screws which were placed on the meter shaft face 
forward. The water caused them to turn right-handed, 7. ¢., the top of the wheels turned to 
the right. When located on the left of the model they corresponded to in-turning screws, and 
when on the right-hand side of the model they correspond to out-turning screws. 
When the meter wheel is on the left-hand side and one of the blades is extended ver- 
tically upward, its face slants forward and inward and is more nearly normal to the path 
of water following the water lines than when it is on the right-hand side and the blade sur- 
face slants forward and outward. In this latter position the surface is more nearly parallel 
to the adjacent surface of the ship. 
When the wheel is on the left-hand side of the model and one of the blades is extended 
horizontally inward, the face slants downward and forward and is somewhat parallel to the 
buttock lines of the adjacent hull. When the wheel is on the right-hand side, the face of an 
inward extending blade is slanting forward and upward or at right angles to the buttock 
lines of the adjacent hull. 
The tip of the 53¢-inch wheel reaches over nearly to the center line of the model, and 
the larger wake which is recorded when on the right-hand side must be caused by a flow 
approximately parallel to the buttock lines. As the wheel tips clear the center line more and 
more, as is the case in the smaller sizes, the predominating effect is that of a flow parallel to the 
water lines, and the wheel on the left-hand side shows a greater wake. 
