Submersible double cylindrical container with outer welded covers

Claim 1

FOR USE IN SUBMARINE CABLE INSTALLATIONS, A WATERTIGHT SUBMERSIBLE CONTAINER ADAPTED TO HOLD AND PROTECT ELECTRICAL APPARATUS AND THE LIKD AND TO WITHSTAND WATER PRESSURE WHEN SUBMERGED, SAID CONTAINER COMPRISING, IN COMBINATION, AN INNER, PRESSURE-RESISTANT THICK-WALLED CYLINDER FREE OF WELD SEAMS, SAID INNER CYLINGER INCLUDING A CYLINDRICAL PERIPHERAL WALL HAVING CONTINUOUS OUTER AND INNER SURFACES, AND TWO TRANSVERSAL END WALLS AT OPPOSITE ENDS OF SAID CYLINDRICAL PERIPHERAL WALL AT LEAT ONE OF SAID TWO TRANSVERSAL END WALLS FORMING A REMOVABLE COVER, SAID WALLS CONSISTING OF PRESSURERESISTANT STEEL AND BEING OF SUBSTANTIAL THICKNESS SO AS TO HAVE HIGH MECHANICAL STRENGTH AND BE ADAPTED TO WITHSTAND WATER PRESSURE WHEN SUBMERGED IN WATER; AND AN OUTER CLOSED SEALING CYLINDER INCLUDING A THIN TUBULAR PERIPHERAL WALL ENCLOSING SAID CYLINDRICAL PERIPHERAL WALL OF SUBSTANTIAL THICKNESS OF SAID INNER PRESSURE-RESISTANT CYLINDER, SUPPORTED BY THE SAME, AND OF TWO TRANSVERSAL END WALLS LOCATED OUTWARDLY FROM SAID TRANSVERSAL END WALLS OF SAID INNER PRESSURE-RESISTANT THICK-WALLED CYLINDER SUPPORTED BY THE SAME AND WELDED TO AND WATERTIGHTLY CLOSING ALONG THEIR EDGES THE OPPOSITE ENDS OF SAID THIN TUBULAR PERIPHERAL WALL OF SAID OUTER CLOSED SEALING CYLINDER, THE WALLS OF SAID OUTER CLOSED SEALING CYLINDER CONSISTING OF HIGH GRADE AUSTENITIC STEEL, WHEREBY SAID OUTER CLOSED SEALING CYLINDER WILL BE SUPPORTED BY SAID INNER CLOSED THICK-WALLED PRESSURE-RESISTANT CYLINDER WHILE SAID OUTER CLOSED SEALING CYLINDER WATER-TIGHTLY ENCLOSES SAID INNER PRESSURE-RESISTANT THICK-WALLED CYLINDER.