Pacing the Wind
N instrument has been recently brought out that indicates the speed of the wind at any given moment. Ordinary anemometers give only the average speed for one minute, or for some other interval of time, during which their revolutions must be counted. With the new instrument the velocity of the wind in feet per minute or miles per hour during gusts can be read off a dial at gny given moment. A two-bladed windmill is mounted on the spindle of a tiny dynamo. This dynamo has permanent magnets like those of a magneto, so that current is generated even at low speeds, the voltage varying exactly with the number of revolutions. All that is necessary, therefore, to complete the instrument is a voltmeter, the scale of which is marked in wind velocities, ‘These instruments will be invaluable for measuring the strength of wind gusts on exposed sites for bridges, factory chimneys and other structures.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300725.2.72.3
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Radio Record, Volume III, Issue 54, 25 July 1930, Page 34
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157Pacing the Wind Radio Record, Volume III, Issue 54, 25 July 1930, Page 34
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