Details
A rare 19th-Century lacquered-brass air-flow meter,
signed on one of two cross bars Biram's Patent Anemometer Davis Derby No. 63, the suspension point with swing handle and enclosed dial mechanism, the two dials engraved 1-10, one dial clockwise, the other anti-clockwise, one labelled CS, the other XS, the twelve-blade fan driving via spiral and pinion gear, the vertical shaft running from the axis of the fan to the dial casing, with protective outer rings -- 6.3/8in. (16.2cm.) diameter, overall height 9in. (223cm.)
See Colour Illustration and Detail
signed on one of two cross bars Biram's Patent Anemometer Davis Derby No. 63, the suspension point with swing handle and enclosed dial mechanism, the two dials engraved 1-10, one dial clockwise, the other anti-clockwise, one labelled CS, the other XS, the twelve-blade fan driving via spiral and pinion gear, the vertical shaft running from the axis of the fan to the dial casing, with protective outer rings -- 6.3/8in. (16.2cm.) diameter, overall height 9in. (223cm.)
See Colour Illustration and Detail