LIQUID/LIQUID, LIQUID/GAS OR GAS/GAS SEPARATION Method General operations by centrifugal force, using centrifuges or free-vortex apparatus using magnetic or electrostatic effect Apparatus General operations by centrifugal force, using centrifuges or free-vortex apparatus , using magnetic or electrostatic effect SOLID/LIQUID OR SOLID/GAS SEPARATION Method General operations by centrifugal force using centrifuges or free-vortex apparatus using magnetic or electrostatic effect Apparatus General operations by centrifugal force using centrifuges or free-vortex apparatus , using magnetic or electrostatic effect SOLID/SOLID SEPARATION Method Dry methods material in bulk Individual sorting Screening, sifting, pneumatic sorting using pneumatic tables or jigs by magnetic or electrostatic effect by centrifugal force using centrifuges or free-vortex apparatus Wet methods General operations flotation, differential sedimentation screening Combinations Dry methods - wet methods Apparatus Dry methods material in bulk Individual sorting Screening, sifting, pneumatic sorting using pneumatic tables or jigs by magnetic or electrostatic effect by centrifugal force using centrifuges or free-vortex apparatus , Wet methods General operations flotation, differential sedimentation screening Combinations Dry methods - wet methods HULLS Study; general characteristics ; General; adjustable keels; protection ; ; Particular types , Subdivision; cleaning of tanks ; SUPERSTRUCTURES; HULL OR SUPERSTRUCTURE OPENINGS ; EMPTYING, BALLASTING; STABILITY; SAFETY , ; ; MOORING, SHIFTING; HANDLING LIFEBOATS ; ACCOMMODATION FOR CARGO OR PERSONS , , ARRANGEMENTS OR ADAPTATIONS OF SIGNALLING OR LIGHTING DEVICES OR OF NAUTICAL INSTRUMENTS , DETAILS AND ACCESSORIES FOR SHIPS CONSTRUCTION, MAINTENANCE, CONVERSION, NOT OTHERWISE PROVIDED FOR PARTICULAR KINDS OF SHIPS OR FLOATING STRUCTURES NOT OTHERWISE PROVIDED FOR , BUOYS; MARKING NAVIGATION ROUTES ; LANDING, LAUNCHING Dry-docking; storing on land; launching or hauling-out ; ; Transporting overland Slipway and dry-dock equipment SALVAGE, SEARCHING UNDER WATER; LIFE-SAVING , ; WORKING UNDER WATER OFFENSIVE OR DEFENSIVE INSTALLATIONS OR ARRANGEMENTS Guns, missile launchers Launching torpedoes; defence against torpedoes ; Defence or attack against sub- marines, by depth charges or otherwise , Mines: laying; sweeping; other defence ; ; Other defensive or offensive arrangements Ammunition handling or storing SUBMARINES; AIRCRAFT CARRIERS ; PROPULSIVE ELEMENTS; ARRANGEMENTS THEREOF Acting directly on water: elements; arrangements , ; Arrangements of means acting directly on air Acted on by wind propulsive devices PARTICULAR MEANS by reaction; by muscle power; by anchored cable; wind motors driving water-engaging devices ; ; ; Other OUTBOARD PROPULSION UNITS PROPULSION POWER PLANT TRANSMISSION FROM POWER PLANT TO PROPULSIVE ELEMENTS STEERING, DYNAMIC ANCHORING In this subclass, the following term is used with the meaning indicated: "auxiliaries" means only apparatus specially arranged for rendering vessels, in general, habitable or operative, in so far as such apparatus is not specifically provided for in another subclass of class .