Page:Popular Science Monthly Volume 92.djvu/818

 Salvaging Ships Sunk by Submarines

��PUMP SUCT !

���AIR COMPRESSOR <4-FLEXIBLE^ AIR-TUBE

���Raising a Hull by Pumping a Buoyant Mixture Into It

��SalvaKC ships on the surface and section of sunken ship of usual carvjo-carryinK type below. Connection is made, extendinK throuRli all three hatchways of the ship to its hold, by a flexible tube secured within another tlexiljle tube and continued within a metal pipi- couph-d to the latter. The metal pipe is secured to a temporary hatch-cover, with manhole for the up- per hat< iiway. and carries a ladder and w<*kinR plat- forms for divers. The entire construction is further reinf(jrccd by brace rods wherever they are needed

��The inner flexible tube is connected with a centrif- ugal pump in the salvage sliij). A derrick supports the tubing. A suction pipe with a cut-off valve or seacock leads from the centrifugal purap to tht»opeo sea. It connects with a hopper that receive* the buoyant material. The paratVm conies through a pipe from the paraffin tank where it is kept liquidand heated by a steam coil connected with the ship's boiler An air pump is connected by a pipe to a i-pace between the outer and the inner flexible tubing

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