DEWAR VESSEL n.
A double-walled glass vessel for holding liquid air, etc., having the space between the walls exhausted so as to prevent conduction of heat, and sometimes having the glass silvered to prevent absorption of radiant heat; -- called also, according to the particular shape, Dewar bulb, Dewar tube, etc.
DOCK n.
me buoyant, and, by floating, to lift a vessel out of water. -- Graving dock, a dock for holding a ship for graving or cleaning the bottom, etc. -- Hydraulic dock, a dock in which a vessel is raised clear of the water by hydraulic presses. -- Naval dock, a dock connected with which are naval stores, materials, and a…