DEEP-SEA EXPLORATION. 
339 
The ratio designated q> (t) by Dittmar is omitted, and only its reciprocal is given 
in the column headed m. The values there given appertain to the temperatures on 
the same horizontal lines given in the first column. The use of this function is 
illustrated in the examples in which it appears as a multiplier for the pui'i)ose of 
allowing for the different rates of expansion between standard water and the water 
the density of which is being determined. 
The last column has been added to this table for convenience, and gives the 
correction for change in the volume of the hydrometer itself. The values given have 
been computed for the mean reading lOUG, and wdth the assumed coefficient of cubical 
expansion for glass « = . 000025. 
Table for reducin;/ densities of sea water to 15° C. 
o 
.0 
.1 
2 
.3 
.4 
.5 
• G 
.7 
.8 
.9 
III 
0 
28. 08 
28. 07 
28. 07 
28. 06 
28. 06 
28. 05 
28. 04 
28. 0-1 
28. 03 
28. 03 
. 951 
1 0. 38 
1 
.02 
.01 
. 01 
.00 
.00 
27. 99 
27. 99 
27. 98 
27. 97 
27. 97 
.955 
..35 
*2 
27. 96 
27. 96 
27. 95 
27. 94 
27. 92 
.92 
.91 
.90 
.89 
.88 
. 960 
.33 
3 
.87 
.87 
.86 
.85 
.84 
.83 
.82 
.81 
.80 
.79 
.963 
.30 
I 
.78 
.77 
.76 
.75 
.74 
.72 
.71 
.70 
.69 
.68 
.967 
.27 
5 
.67 
.66 
.65 
.64 
.63 
.61 
. 60 
.59 
.58 
.57 
.970 
.25 
r, 
.56 
. 55 
.53 
.52 
.51 
.50 
.48 
.47 
. 46 
.44 
.973 
.23 
; 
.13 
.41 
.40 
.38 
.37 
.35 
.34 
.32 
.31 
.30 
.976 
. 20 
8 
.28 
.26 
.25 
.23 
. 22 
.20 
.19 
. 17 
.16 
.15 
.980 
. 17 
!) 
. 13 
. 11 
. 10 
.08 
.07 
.05 
.03 
.02 
.00 
20. 98 
.983 
. 15 
to 
26. 97 
26. 95 
26. 93 
26. 92 
26. 90 
26. 88 
20.16 
26. 84 
26. 83 
.81 
.986 
. 13 
11 
.79 
.77 
.75 
.74 
.72 
.70 
.68 
.06 
.65 
.62 
.989 
.111 
12 
.61 
.59 
.,57 
. 55 
.53 
.51 
.49 
.47 
.45 
.43 
. 992 
.08 
13 
.41 
.39 
.37 
.35 
.33 
.31 
.29 
.27 
.25 
.23 
. 995 
.05 
11 
.21 
. 19 
. 17 
. 15 
. 13 
. 10 
.08 
.00 
.04 
.02 
. 997 
. 02 
15 
.00 
25. 98 
25. 95 
25. 93 
25. 91 
25. 88 
25. 86 
25. 84 
25. 82 
25. 79 
1. 000 
.00 
IG 
25. 77 
.75 
. 72 
.70 
.68 
.65 
.63 
.61 
.59 
.56 
1. 003 
—0. 02 
i; 
.54 
.52 
.49 
.47 
.45 
.42 
.40 
.38 
.35 
. 33 
1. 005 
.05 
18 
.30 
.27 
. 25 
22 
.20 
. 17 
. 14 
. 12 
.09 
. 07 
1.007 
.08 
10 
.04 
.01 
24. 99 
24. 96 
24. 94 
24. 91 
24. 88 
24. 86 
24. 83 
24. 80 
1.009 
. 10 
20 
24. 78 
21. 75 
.73 
.70 
.68 
.65 
.62 
.60 
.57 
.54 
1.011 
. 13 
21 
.52 
.49 
.47 
. 44 
.41 
.39 
.36 
.33 
.30 
.28 
1.013 
. 15 
22 
.25 
.22 
. 19 
.16 
.13 
. 10 
.08 
.05 
.02 
23. 99 
1.015 
. 17 
23 
23.96 
23. 93 
23. 90 
23. 87 
23. 84 
23.82 
23.79 
23. 76 
23. 73 
. 70 
1.018 
.20 
24 
.67 
.64 
.61 
.58 
.55 
.53 
.50 
.47 
.43 
.40 
1.020 
.23 
25 
.38 
.35 
.32 
.29 
.26 
.23 
.20 
. 17 
. 14 
. 11 
1.022 
.25 
20 
.09 
.06 
.03 
23. 00 
22. 97 
22. 93 
22. 90 
22. 87 
22. 84 
22. 81 
1. 024 
. 27 
27 
22. 78 
22. 75 
22. 72 
22. 68 
.65 
-.62 
.59 
.56 
.53 
.50 
1.026 
.30 
28 
.46 
.43 
. 39 
.36 
.33 
.29 
.26 
.23 
.20 
.16 
1.027 
.33 
20 
. 13 
. 10 
.06 
.03 
.00 
21.96 
21.93 
21. 90 
21.87 
21. 84 
1.029 
.35 
30 
21. 80 
21.77 
21. 73 
21.70 
21.67 
.63 
.60 
.57 
.54 
. 50 
1.031 
.38 
The following directions are given to facilitate the use of the table: The observed 
specific gravity having been taken, record the actual reading of the hydrometer and 
thermometer, and apply the correction to the latter to get the true temperature t. To 
the reading of the hydrometer apply the correction a, for expansion of hydrometer, 
according to its sign, which will give the observed density at i = OD. The density of 
standard sea water at t = SIJ, and the difference between observed density and density 
of standard water at ^ = OD — SD, being multiplied by the tabular multiplier m, and 
the quotient applied to standard sea water at 15° G., according to its sign, gives the 
corrected density of the sample water at 15° 0. 
