128 THE EFFECT OF WAVES UFON A TAFFRAIL LOG. 
Plotting the ratios of Veure to Vi. on the speed of the ship as abscissze we 
would expect the curve of Fig. 7 to pass through these points which, as you 
see by Fig. 8, it does. 
The order in which the steps have been stated was not quite the same 
actor fer Log 
Fic. 8. 
as that followed in first working out the results, as no calibration was made 
of the log in still water and this (curve A-B, Fig. 7) had to be derived by 
successive approximations but, except for this, the steps were in the order 
given. 
” Sankaty ” 
yo% = 
zr VATS EK, 
A=32.7 
I ! | | | | | 
1 | | | { { { | 
AiP 
ves V=9.07 K. 
_ ¢ 
{ { | ( ( ( { Zz nate 
7 | I { | | | | 
Alp 
ae V=/0.95-K. 
y A= 67° 
| | | \ i Zo 
Wy | | | | 
MP Log Towed 133° behind AP. 
V=/3.88 K, 
[> As/07" 
Stern Wave System at speeds al whith 
Bow Wave System supetposes 
Fic. 9. 
The author realized that one experiment hardly constituted proof 
even though it analyzed so satisfactorily and on the progressive speed trials 
of the steamer Sankaty, built at the Fore River Company’s yard, which trials 
