500 



[chap. 23 



For many years, French marine scientists (e.g. Tregouboff, 1955, 1956) 

 have made use of the Galeazzi diving chamber aboard the research vessel Elie 

 Monnier descending as deep as 300 m. The chamber is, of itself, buoyant and 

 sinks because of an attached ballasting weight which can be jettisoned if the 

 cable breaks. There is constant telephonic communication with the surface 

 ship. The quiet clear waters of the Mediterranean make this region ideal for 

 visual undersea observations. 



POWER & TE 

 CABLE - CAN 



SEARCH LIGH 



STROBE 



500 W SEARCH 



SEARCH LIGHT TURN 

 ELEVATING CONTRO 



TEL 



BOURDON TY PL DEPT 



HYDROPHONE RECE1V 



ADJUSTABLE MIRR 



SIX INCH 

 OBSERVATION W INDO 



FREE GYRO (ELECTR 



OBSERVER 



SEARCH LIGHT 

 POWER CONTROL 

 CAMERA PEDESTAL 

 FISH CATCHER 

 REVOLVING CHAIR I 2) 



'LOO 

 MOTOR -GE 

 FOR GYRO 



PROPULSION MOTOR 

 SONAR TRANSDUCER 

 TURNING GEAR 

 STROBE LIGHT & SPOT L 



FOUR INCH 

 OBSERVATION WINDOWS 



SWIVEL 

 ADJUSTABLE SLINGS 



CH COVER COUNTER WEIGHT 

 BMARINE-TYPE HATCH 

 ROOM LIGHT 



INCH OBSERVATION WINDOW 

 ISTANT 



IN SWITCHBOARD 

 TELEPHONE 

 OXYGEN BOTTLE 



OUR INCH OBSERVATION- 

 WIN DOW 



ROBE-LIGHT CONTROLLER 

 SONAR (ECHO-SOUNDER) 

 MUD SAMPLING CONTROL 

 FIN 



DUCT AS FISH 

 RESERVOIR 



^C 



ELEVATING 

 RUDDER 



MUD SAMPLING DEVICE 

 EMERGENCY RELEASING DEVICE 



BUOY ROPE 

 (EMERGENCY 

 LIFTING WIRE) 



SCREW PROPELLER 

 WITH NOZZLE 



PROPULSION 

 MOTOR STARTER 



TRANSFORMER 



BALLAST 



VENTILATING FAN 



AIR RECONDITIONING UNIT 



BEARING ROLLER (4) 



WOODEN BEARER 



Fig. 2. Outside view of the Japanese oceanographic research diving chamber, Kuroshio, 

 completed in 1952 and subsequently extensively used in Japanese shelf waters to 200 m. 

 (By courtesy of Richard Terry. Ph.D.) 



3. Bathysc&phs 



Since the completion of the prototype bathyscaph FNRS-2 in 1948, bathy- 

 scaphs have remained the only operational untethered deep ships, so that 

 somewhat fuller treatment is accorded them here. The FNRS-2 of A. Piccard 

 successfully completed an unmanned test dive to 1380 m off Dakar in 1948, but 

 waves caused damage to her float preventing further operations. Acquired by 

 the French Navy, the cabin of the FNRS-2 was subsequently incorporated 

 into the new bathyscaph, the FNRS-3. The submersible has subsequently 



