Scientific Papers - Vi

915] HYDRODYNAMICAL PROBLEMS SUGGESTED BY PITOT'S TUBES 335
It is easy to verify that the velocity is constant along the curve denned y (12), (13). We have
dx __ p d% dy £ 1 — f2 dt; nd when ty — 0,
A
00
00
B
00=7T
Thus
Fig. 2.
dy _i-F
nd (dx/d<f>y- + (dy/d<j>)* = I.........................(17)
The square' root of the expression on the left of (1.7) represents the 2ciprocal of the resultant velocity,
TABLE 111.— = .
f X y £ • X y
0 0 00 0-40 2-9667 + 0-076
0-05 0-1667 9-098 0-50 3-0467 0-130
o-io 0-2995 3-008 0-60 3-1089 0-162
0-13 0-4668 1-535 0-80 3-2239 0-198
0-15 0-6725 0-766 1-00 3-3454 0-207 *
0-17 1 -0368 + 0-109 1-50 3-6947 +0-125
0-18 • 1-2977 -0-143 2-00 4-0936 -0-112 .
0-19 1-5907 -0-304 2-50 4-5234 -0-501
0-20 1 -8708 -0-370 3-00 4-9725 - 1 -032
0-22 2-2828 -0-331 4-00 5-9039 -2-536
0-25 2-5954 ^0-195 6-00 7-8305 -7-161
0-30 2-8036 * -0-047