The object which the Brussels Organization had in view when the specific gravity column was introduced into the sea-journal was that hydrographers might find in it data for computing the dynamical force which the sea derives for its currents from the difference in the specific gravity of its waters in different climes.
The specific gravity column in the sea journal was designed to help hydrographers understand the relationship between water density and ocean currents. This data could be used to calculate the dynamic force that drives these currents, which is a key aspect of understanding oceanography.