Accession No
1185
Brief Description
Biram's patent anemometer, by John Davis and Son, English, 2/2 19th Century
Origin
England; Derby
Maker
John Davis and Son
Class
physics
Earliest Date
1845
Latest Date
1900
Inscription Date
Material
metal (brass); glass
Dimensions
height 120mm; diameter 105mm; thickness 30mm (max height 142mm; 27-1-2000)
Special Collection
Provenance
Inscription
‘BIRAM’S PATENT DAVIS DERBY 353A’ (on crosspiece)
Description Notes
Biram’s anemometer, for measuring air speeds in mines, tunnels, etc
Brass cylinder. Central axis for oblique fan. Central glazed dial graduated [0]-10 (10 marked as ‘X’; 27-1-2000). Brass crosspiece either side. Shackle.
Condition: fair.
References
Events
Description
This instrument was used to measure ventilation and air flow in mine shafts. It was suspended with the vanes facing the air flow for a certain number of minutes. The revolutions of the fan turn the counter on the central dial. The velocity of air flow is calculated from the number of revolutions in a given time.
This air meter was designed by Benjamin Biram in 1845 and made by the mining instruments firm of John Davis of Derby.
26/03/2008
Created by: Dr. Anita McConnell on 26/03/2008
FM:43451
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