. Earth, sky, and sea . Fig. io. The Trieste. Joining the two hemispheres of the cabin OPENINGS FOR CABLES AND TUBES THROUGH THE WALL The passage of the cables and tubes through the wall of the cabin raised difficult problems. A number of thin copper wires had to con- duct the electric current to various instruments placed outside the cabin: magnetic valve and electro-magnet for the ballast; telephone, radio, tachometers and some small electric bulbs. The projectors, the motors and, as originally planned, the accumulators required con- ductors of rather large cross-section. Furthermore, a tube
. Earth, sky, and sea . Fig. io. The Trieste. Joining the two hemispheres of the cabin OPENINGS FOR CABLES AND TUBES THROUGH THE WALL The passage of the cables and tubes through the wall of the cabin raised difficult problems. A number of thin copper wires had to con- duct the electric current to various instruments placed outside the cabin: magnetic valve and electro-magnet for the ballast; telephone, radio, tachometers and some small electric bulbs. The projectors, the motors and, as originally planned, the accumulators required con- ductors of rather large cross-section. Furthermore, a tube was needed to connect the pressure gauge with the external water-pressure; and another for the compressed air which was to drive the water out of the entrance shaft. Last, two schnorkel tubes, with cross-section sufficiently large to provide ventilation for the cabin when the bathyscaphe was on the surface. These openings had to comply with two conditions. First, the pressure had in no case to be able to drive the conduit [90]
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