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arrangement used by smugglers in recovering contraband articles sunk by them consisted of a cask having a plate of glass at the bottom. This end was plunged a few inches below the surface. Seal-hunters use the same contrivance. See patents: Mather, April 16, 1845; Day, April 16, 1850; Mather, July 5, 1864. Subma-rine Ther-mome-ter. (Nautical.) A chamber having valves above and below, and inclosing a thermometer, is lowered to the required depth, the water flowing upward through theMather, July 5, 1864. Subma-rine Ther-mome-ter. (Nautical.) A chamber having valves above and below, and inclosing a thermometer, is lowered to the required depth, the water flowing upward through the chamber as it descends. When the descent is checked, the valves close, and the chamber is hauled up, containing water from the depth reached. A registering-thermometer is now used. See Ther-Mometer. Subma-rine′ valve. A port or valve in the side of a vessel, opening beneath the surface of the water, for the purpose of protruding a torpedo, the muzzle of a gun to be fired under water, or some other offensive weapon. See submarine gun; torpedo. In the example (Fig. 6035), the val<