ocr: SUBMARINE UBMARINES CAN TRAVEL PROPELLER RUDDER PERISCOPE Oboth on the water surface - - / - and at varying depths beneath the sea. This is achieved by using a system ofballast tanks which can hold either air or water. By adjusting the amount of water in the tanks, the weight and buoyancy ofthe craft can be LUHRL, precisely regulated. The HYDROPLANE. X - submarine's depth can also A - EI - be controlled by swiveling - - A 2a TDIVE - by fins calledhydroplanes. COMPRESSED - de 4 AIR TANKS 4 t T - CONNING - - - - TOWER - - - Submersible # - - VALVE HULL BALLAST TANK REAR. EE HYDROPLANE FRONT V - ...
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