A Siebe, Gorman & Co.Ltd. 6-Bolt Admiralty Pattern diving helmet numbered 18400 (matching), mid 20th-Century

細節
A Siebe, Gorman & Co.Ltd. 6-Bolt Admiralty Pattern diving helmet numbered 18400 (matching), mid 20th-Century
the spun tinned bonnet with front port etched Boston Divers Ltd, left mounted spitcock, non-return air inlet valve, telephone valve, adjustable exhaust valve, factory added forth port with cross banding, weight hooks and securing pin, internal details including buzzer, two-way [?] telephone, (central air vent shortened to accomodate extra port), the tinned corselet with weight pins front and back, weight rope and makers plate, the neck ring inscribed Boston Divers Ltd, 1956, contained within contempory wooden storage box with shoulder cushion, bolt key etc inside, painted grey and stencilled C.T. Pickering, Boston Divers, with rope carrying handles -- 19½ x 19½ x 22¼in. (49.5 x 49.5 x 56.5cm.); together with a chest of spares including bolts, bolt tightener, face plate, glass, gaskets etc -- 18¼ x 7 x 10¼in. (46.5 x 18 x 26cm.); the helmet -- 19in. (48cm.) high
See illustration (2)
來源
Admiralty to Boston Divers Ltd.