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细节
A fine 12-bolt diving helmet by Siebe, Gorman & Co. numbered 4774 (matching), circa late 1890's
complete with original tinning, the hand beaten and brazed copper bonnet with numbered face plate, oval side ports with grills, weight hooks, air inlet with non-return valve, adjustable exhaust valve stamped Gorman Patent, hinged securing pin and lashing eyes; the corselt with signed and numbered brass straps, twelve wing nuts, weight pins and cast makers plate; the interior complete with air vents -- 17in. (44.5cm.) high; together with original bolt tightener
See illustration
complete with original tinning, the hand beaten and brazed copper bonnet with numbered face plate, oval side ports with grills, weight hooks, air inlet with non-return valve, adjustable exhaust valve stamped Gorman Patent, hinged securing pin and lashing eyes; the corselt with signed and numbered brass straps, twelve wing nuts, weight pins and cast makers plate; the interior complete with air vents -- 17in. (44.5cm.) high; together with original bolt tightener
See illustration