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UNITARY SHIP'S LOG APPARATUS OF WHICH THE FOLLOWING ARE THE CONSTITUENT PARTS: ROD METERS, SEA VALVES, COMPRISING GATE VALVES AND GEAR FOR OPERATING SAME; ROTARY DISTANCE TRANSMITTERS, COMPRISING ROTARY PUMPS, ELECTRIC DRIVING MOTORS, VARIABLE AUTO-TRANSFORMERS, RECTIFIERS, SELF-SYNCHRONOUS MOTORS, FOLLOW-UP MOTORS, REVOLUTION COUNTERS; HYDRAULIC BELLOWS AND ELECTRIC CONTACTS OPERATED THEREBY; MASTER SPEED INDICATORS; SPEED AND DISTANCE INDICATORS; AND CONSTANT FREQUENCY CONTROL APPARATUS FOR CONTROLLING THE FREQUENCIES OF THE ALTERNATING CURRENT OUTPUT OF A ROTARY CONVERTER AND COMPRISING SYNCHRONOUS MOTORS, ELECTRICALLY DRIVEN TUNING FORKS, AMPLIFIER TUBES, RHEOSTATS, TRANSFORMERS, CONDENSERS, AND ELECTROMAGNETS