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Lot 713 - 07 Nov 2017

Autumn Fine Auction

A late Victorian oak and brass-mounted Miner's or Pit-head stick barometer
By Negretti & Zambra, London, circa 1890

The plain case with an arched pediment, above a glazed brass surround with silvered plates, signed 'NEGRETTI & ZAMBRA LONDON', and fitted with a thermometer, the trunk with canted angles

90.5cm high. Illustrated

These were used in determining the risks from inflammable and suffocating gases, known to miners as 'firedamp' and 'choke damp'. As the gas was heavier than air, and combined with a drop to low atmospheric pressure, it would be driven to the lowest and least ventilated galleries.

Estimate £200 - £300
Sold For £160