Antique Air Meterdetails

Antique Air Meter

Out of copyright (called public domain in the USA), hence royalty-free stock image for all purposes usage credit requested
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An antique brass machine for measuring wind speed.

The text in the label in the box reads (as much as I can read of it) as follows:

International Inventions Exhibition Awarded Silver Medal

Correction for Air-Meter No. 20

Add 30 per minute to the observed reading of the Air-Meter.

Note—Each measurement[?] is regulated so as to reduce the co[missing] to a constant quantity per minute, which must be[missing] in the example given.

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Ellesmere Port, Cheshire, England

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