How was salinity measured before the use of salinometers?

Name: How was salinity measured before the use of salinometers?
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Marine chemists used silver nitrate to measure the chlorinity of a water sample. Equations were then used measure convert the chlorinity to the salinity of the sample. The procedure is calibrated against a known sample. Now salinometers are used by measuring the electrical conductivity. Information can be found in the section Seawater Consists of Water and Dissolved Solids.

How Was Salinity Measured Before the Use of Salinometers