This image is released under a Hand anemometer 1997
Meteorological Office hand anemometer with three cups, unknown maker, 1997. Stamped on reverse: type 1438, serial no. 552429. Labelled with Met Office reference 23510.
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Hand anemometers are portable devices used to measure wind speed at the level of the observer. Three cups are mounted on vertical spindle to which is also attached a permanent magnet. An aluminium cup mounted on a pivot, below and concentric with the spindle, carries a pointer. When the cup wheel rotates in the wind, the rotating magnet induces eddy currents in the aluminium cup which tries to turn in the same direction as the magnet against a restraining hair spring. The angular movement of the aluminium cup and the pointer gives a measure of the wind speed.
To use the instrument, the observer holds the anemometer at arms length with its axis vertical, with their arm at right angles to the wind direction to minimise interference from their body.
- Measurements:
-
overall: 205 mm x 110 mm, .425 kg
- Materials:
- plastic (unidentified) and metal (unknown)
- Object Number:
- 1999-202/1
- type:
- anemometer
