17 
certain minimum number of points, by substituting values in the three 
given equations. As a first step let us substitute a value of Cl. in 
the first equation, which will result in the lowest value in the range 
of salinities which it is desired to span. A few trials indicate that a 
value of Cl. equal to 17.5 gives a desirable value of s equal to 31.618 
per mille, which in turn is substituted im equation (2) furnishing the 
numeral 25.4025 as the value of 6,. This again is substituted in 
equation (3) along with the values for A;, Bi, and =, for every two 
degrees change in the range of temperature known to prevail in the 
particular region which is under investigation. Thus we obtain a 
series of values for a salinity of 31.618 per mille, and in the same man- 
ner, another series of temperature points on the graph using other 
values of salinity, as shown in Table I: 
TABLE I 
| 
Cl Si 50 5o—1324 | 6541324 
17. 5000 31. 618 25. 4025 25.2701 | 25, 5349 
18. 000 32. 520 26, 1267 25.9943 | 26. 2591 
27.0138 | 27. 2786 
5 i - 0 | 29.0638 
20. 482 37. 000 29. 7390 26. 6069 | 28.8717 
Jie, 
The values as tabulated in Table I, upon further substitution, re- 
sult in the following values as given in Table II: 
TasLe II 
Tem- Densities 3 
pera- Sia 
ture 
aoe 2 a b c d e f 
Having determined arguments 1, 2, and 3, we are now provided 
with data sufficient to fix the construction of a graph which in turn 
furnishes a rapid means of obtaining density values from given tem- 
peratures and salinities. 
