Early 20th century lacquered and patinated brass cased “Zero Setting Airmeter, Patent No 3729 – Elliott Bros – London, No 3271”, the cylindrical case set with a glazed 5 ½ cms silvered dial with outside scale of 0 to 100 and subsidiaries for 100ths, 1000ths, 10,000ths, 100,000ths and millionths, all with blued steel indicator hands and further fitted with an impeller at 3 and with screw fitting base, all contained within a fitted mahogany case with hinged cover (some internal losses), width 11cms
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