290 Dr. T. H. Havelock. [Apr. 1, 
experiments, and these were such that it was possible to make a mean 
residuary resistance curve, the effects of bow and stern interference being 
eliminated. The curve is given as total residuary resistance in tons on a 
base of V in knots. If we work in lbs. per ton, we find there is a very fair 
agreement with formula (20) if we take 
as PMs == 2s 7S O 
Probably a closer agreement could be obtained by further slight adjustment 
of a and B. Fig. 5 shows a comparison of values of the total residuary 
resistance for the ship (in tons); the calculated values are indicated by small 
circles. 
Ill. D. W. Taylor, 1000 lbs. Model. 
Length on water line = 20°51 feet; cyl. coeff. = 0°680. 
The experimental curve in this case is given as residuary resistance for 
the model in lbs. on a base of V in knots. With the same notation as before 
we find 
a2=2; B=136605 y= 0-14. 
Putting these values in (20), we can calculate R in lbs. per ton, and hence 
R, in lbs. for the model; fig. 6 shows the comparison between R, and the 
corresponding values on the curve; the calculated values Rj are indicated by 
dots. 
Deland ea 
37.5 
Fic.6 
30 
: oF 
B} 7S ¢ i] 125 LS 1.75 2 2.25 
o Alte & 
48 
