Strictly a field science is oceanography. For investigations of great ocean rivers like the Labrador & Humboldt Currents and the Gulf Stream, of wind-driven surface currents, of the habits and distribution of marine life and of many another aspect of the sea's vast and various lore, oceanographers must record temperatures not only at the surface but at considerable depths. Nearly a century ago a Frenchman named Aimé used a "reversing thermometer" for taking depth temperatures in the Mediterranean. This instrument had a constriction in the tube above the bulb. Having been lowered...
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