Abstract
REFERENCE is made in Engineering for December 16 to a paper by Mr. H. Frahm at the November meeting of the Schiffbautechnische Gesellschaft, in which the author describes his apparatus for reduction of rolling in ships. In this apparatus two water tanks are disposed on opposite sides of the centre line of the ship near the shell, and are connected below by a water conduit and above by an air conduit; a throttle valve is inserted in the latter. The water tanks are filled partly with water, which may oscillate in the closed circuit formed by the conduits. If the throttle valve is closed oscillation is practically prevented; with the valve full open the oscillations are unobstructed, excepting that free waves cannot arise.
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