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Image © National Museums Scotland
View full screenBubble sextant comprising of a black crackle-lacquered alloy casing incorporating artificial materials, housing optical equipment, a clockwork averaging mechanism, electrical equipment, and a rubber eyecup, in a fitted aluminium case, signed by Henry Hughs & Son Ltd, London, c. 1940
EF.1994.49
H. Hughes and Son Ltd, Instrument maker
London, England, Northern Europe
c. 1940
Ifland, Taking the Stars, 167-9; Hughes, History of Air Navigation, 119-29