208 The Wave-making Resistance of Ships. 
constant midship-section coefficient 0°926, and with the ratio of beam to draft 
2:923 ; the cylindrical coefficients are 0:68, 0°60, and 0°48. 
120 
Figure 4. 
oa 
& RESISTANCE) © LBs PERTINO 
0-4 0-8 o2 0-6 2-0 0-4 
The curve with a coefficient of 0°68 is represented quite well by formula (2) 
with a=2, B=155, y=014, m=29, n= 584; the circles represent 
calculated points. The typical oscillations are clearly visible in this curve 
but they appear to be absent altogether from the other two curves; the 
general character of the latter curves is in accordance with the remarks made 
above. One may even obtain some numerical agreement with y zero and 
larger values of 8 and m, but it is unsatisfactory without a further examina- 
tion of intermediate stages and their equivalent pressure distributions ; 
another point is that with a larger value of m the first term in the formula, 
which represents the diverging waves, becomes more important, and adds 
another reason for deferring the study of finer-ended models. 
HARRISON AND Sons, Printers in Ordinary to His late Majesty, St. Martin’s Lane. 
80 
