. Earth, sky, and sea. Trieste (Bathyscaphe); Balloons. plug and the watertightness is perfect for all pressures ; it is an auto- clave closing. The rubber ring which surrounds the upper rim of the. / /, -k -J. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Piccard, Auguste, 1884-1962. New York, Oxford University Press

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