59 
Number of revolutions 
Speed of ship 
91-04 
16-577 
82-148 
15-123 
65-105 
12-064 
43-358 
8-187 
5-49 
5-43 
5-40 
5-30 
The remaining three series of experiments in the “ Iris ” 
afford the same confirmation of this inference as that given 
by the first series. 
It follo’ws also from (27) that the resistance of ship 
and propeller is proportional to the force of the engines to 
turn the screw propeller. 
The truth of this inference is strongly confirmed by the 
following table given by Mr. Froude to show the manner 
in which the indicated horse power is applied ‘4n the case 
of the Merkara; but the table, mutatis mutandis, will 
represent pretty nearly their relative values in other ships” 
(see Transactions of the Institution of Naval Architects 
1876, page 175, fig. 7 plate XI) : — 
Speed of ship in 
knots per hour. 
H.P. friction of 
unloaded engine. 
H.P. friction of 
loaded engine. 
H.P. air and 
feed pumps. 
H.P. friction of 
screw. 
H.P. augment of 
resistance. 
H.P. net re- 
sistance. 
H.P. indicated 
(Total). 
H.P. friction of 
engine, or sum 
of A, B, C. 
H.P. available to 
turn screw. 
Values of 
/ G^K \ 
V speed 2/ | 
A 
B 
c 
Gr 
K 
a-K 
D 
3 
84 
6 
10 
6 
20 
34 
160 
100 
60 
6-6 
4 
100 
10 
15 
10 
30 
65 
230 
125 
105 
6-6 
5 
117 
18 
20 
15 
45 
95 
310 
155 
155 
6-2 
6 
160 
. 30 
30 
22 
60 
133 
435 
220 
215 
6-0 
7 
180 
45 
45 
30 
90 
190 
580 
270 
310 
6-3 
8 
225 
85 
60 
40 
110 
255 
775 
370 
405 
6-3 
9 
265 
140 
90 
50 
150 
340 
1025 
495 
530 
6-6 
10 
290 
185 
110 
65 
195 
485 
1330 
585 
745 
7-4 
11 
310 
260 
160 
76 
264 
680 
1750 
730 
1020 
8-4 
12 
335 
325 
180 
90 
400 
990 
2320 
840 
1480 
10-3 
