The development of electrical anemometers

The paper outlines the development of instruments for measuring and recording wind speed and direction by various electrical means. Methods of calibration and standardization are discussed in relation to the accuracy and speed of response of standard instruments, and some further models which were made for special investigations, or which are still in the development stage, are described. For general use in the Meteorological Office, the most suitable combination of instruments is a cup anemometer of the generator type with an autographic recorder consisting of some form of recording voltmeter and a remote-recording wind vane connected by a self-synchronous a.c. transmission system to a recorder which is capable of being operated by a small torque. The cup anemometer will record the speed of the wind and the wind vane will record its direction.