1970s AM5000 Air Flow Developments (AD) Anemometer in Its Original Yellow Leather Case

This wonderful looking hand held scientific instrument is a 1970s AM5000 Air Flow Developments (AD) Anemometer in Its Original Yellow Leather Case. It has 8 vanes and a metres counter, an on/off switch and a reset button.  An essential Health and Safety device as it would have been used to assess air flow in, e.g., a coal mine.

Approximate Size:

• Anemometer diameter: 10.5cm
• Depth: 5.6 cm
• Height: 22.5cm

The polished steel air meter is in very good cosmetic and working condition but I can't attest as to its accuracy. There are a few surface scuffs and scratches commensurate with age and use. The plastic (bakelite) black legs fold down to form a handle. Vanes are stamped from single piece of metal.

Its yellow covered leather transit case is intact but the leather handle has some breakages and the yellow cover is detaching itself from the case body in a few places.

It comes with a brown paper inspection ticket with the stock/DRG number 7372606. Stamped AFD No.2. And a Calibration Correction curve graph is located in the lid of the case.

A very high quality measuring instrument for the industrial ephemera collector.

Marked:

AD AM 500

Brit Pat. No. 1157368 (filed in 1967 by Air Flow Developments Ltd)

Reg. Design No. 932306

Canadian Pat.No. 871822

Dated 25th May 1971

Mechanical anemometers were a piece of safety equipment, invented by Benjamin Biram in 1844, to determine the volume of air entering or exiting mine workings. 

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