Vintage Casella W1208/1 Counter Three Cup Anemometer

This is a very nice Vintage Casella W1208/1 Counter Three Cup Anemometer. A piece of Meteorological Equipment, which measures wind speed in kilometres and is connected directly to a mechanical counter.

This high quality wind measuring instrument is of a similar design to the Munro models. An angled window allows the counter to be read from the ground below. The reading would be taken periodically and noted in a logbook.

The cups and main body do have some loss of colour, and surface scuffs and scratches.

Summary

• Manufactured by Casella London, UK (high quality manufacturers of measurement instrumentation)
• Wind Speed in kilometres (previous models measurement units were statute miles)
• Type: W1208/1
• Approximate Cup Diameter = 12.7cm/ 5″
• Axis to Outer Edge of Cup: approx. 21.5cm (8.5″)

The Casella counter anemometer was one of the most widely deployed anemometers used for wind speed measurements by the UK Meteorological (Met) Office until superseded in the 1990s. In operation, the anemometer is usually mounted on a mast (not included) 10 metres above the ground and in conjunction with a wind direction weather vane (not included).  

We fully intended to erect the anemometer in our garden but, alas, this is one of many projects that hasn’t quite materialised, so it is with some reluctance that we have now decided to part with it. They are very difficult to find never mind in such good cosmetic condition! It hasn’t been hooked up in the past twenty years, hence I can’t vouch for measurement accuracy.

It would make a great garden feature. I like to watch the vane spinning around in the wind! A must have for the meteorologist or anemometer collector in the family!

International customers: please contact me for a shipping quote as the prices quoted vary considerably between couriers, and on a daily basis! I always try to refund for shipping overages wherever possible.

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Some Trivia For You Taken From The Met. Office Website

Wind speed is normally measured by a cup anemometer consisting of three or four cups, conical or hemispherical in shape, mounted symmetrically about a vertical spindle. The wind blowing into the cups causes the spindle to rotate. In standard instruments the design of the cups is such that the rate of rotation is proportional to the speed of the wind to a sufficiently close approximation.

At intervals of no longer than five years, anemometers are calibrated in a wind tunnel to identify any departures in the relationship between spindle rotation and wind speed specified by the manufacturer. Calibration corrections are applied to the measured wind speed.