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ID number:  BIRRC-P0836
Institution:  Research and Cultural Collections
Named collection:  Historic Physics Collection
Artist / Maker:  Casella
Title / Object name:  Air Flow Meter
Object type:  Physics instrument
Place made:  London
Date made:  Not known
Materials:  Metal with glass front in leather case
Measurements:  Case 11 x 8.5 x 10 cm
BIRRC-P0836.jpg

Air blowing past the small fan blades causes the fan to turn. Its revolutions are counted and displayed on the dials. The small dials read ten thousands, thousands and hundreds, with the large dial reading from 0 to 100. The calibration is in terms of the distance in feet by which air has passed through the fan. Airflow speeds in feet per second can be determined by measuring the change in reading of the dials over a known time interval.

Inscriptions / Translations:  CASELLA LONDON
AIR METER TO 100,000 FEET
No D6486
MADE IN ENGLAND

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