REPORT ON THE SPECIFIC GRAVITY OF OCEAN WATER. 
one by 0'005 c.c. at 11 "4 C. than the observed values. This line may therefore 
fairly be taken to represent the thermal expansion of the body of the thermometer. 
According to it the volume at 0° is 160'277 c.c. and at 25° C. it is 160-391 c.c. Taking 
these figures as correct, the coefficient of expansion of the body of the hydrometer 
is 0-0000285. 
The volume of the body of the hydrometer up to the first division on the stem (100) 
being 160 "277 c.c. at 0° C., and the mean volume of each stem division being 
0-00865 c.c., Table III. has been constructed, giving the volume immersed when the 
hydrometer floats at each division in liquid of 0° C. If the temperature of the liquid 
is not 0° C., then the volume has to be corrected in terms of the coefficient of expansion. 
Table IV. gives those corrections for all temperatures between 0° and 30° C. These 
corrections are to be added to the volumes found from Table III. 
Table III. 
Giving the Immersed Volume (V.) of Hydrometer No. 0 at a Temperature 
OF 0° C. FOR EVERY SCALE DIVISION (R.) ON THE STEM. 
R. 
V. 
R. 
V. 
R. 
V. 
R. 
V. 
100 
160277 
74 
160-502 
49 
160-718 
24 
160-934 
99 
285 
73 
511 
48 
727 
23 
943 
98 
294 
72 
519 
47 
735 
22 
951 
97 
303 
71 
528 
46 
744 
21 
960 
96 
311 
70 
537 
45 
753 
20 
969 
95 
320 
69 
545 
44 
761 
19 
977 
94 
329 
68 
554 
43 
770 
18 
986 
93 
337 
67 
562 
42 
779 
17 
995 
92 
346 
66 
571 
41 
787 
16 
161-003 
91 
355 
65 
579 
40 
796 
15 
012 
90 
363 
64 
588 
39 
805 
14 
021 
89 
372 
63 
597 
38 
813 
13 
029 
88 
381 
62 
605 
37 
822 
12 
038 
87 
389 
61 
614 
36 
831 
11 
047 
86 
398 
60 
623 
35 
839 
10 
055 
85 
407 
59 
631 
34 
848 
9 
064 
84 
415 
58 
640 
33 
857 
8 
073 
83 
424 
57 
649 
32 
865 
7 
081 
82 
433 
56 
657 
31 
874 
6 
090 
81 
441 
55 
666 
30 
882 
5 
099 
80 
450 
54 
675 
29 
891 
4 
107 
79 
459 
53 
683 
28 
899 
3 
116 
78 
467 
52 
692 
27 
908 
2 
125 
77 
476 
51 
701 
26 
917 
1 
133 
76 
485 
50 
709 
25 
925 
0 
142 
75 
493 
