Airship. Hydrogen gas tester for an airship by Davis & Sons, (Derby) Ltd circa 1930, with oak and lacquered brass casing, paper dial (some discolouration, printed with arrow for Hydrogen release, the lower section with a similar gauge (directional needle detached), contained in an oak transportation box, 12 cm high x 25 cm wide x 29 cm deep (Quantity: 1)
Airship. Hydrogen gas tester for an airship by Davis & Sons, (Derby) Ltd circa 1930, with oak and lacquered brass casing, paper dial (some discolouration, printed with arrow for Hydrogen release, the lower section with a similar gauge (directional needle detached), contained in an oak transportation box, 12 cm high x 25 cm wide x 29 cm deep (Quantity: 1)
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