On a New Pressure-tube Anemograph combined with Electric Anemoscope

Abstract

A Pitot-static-pressure-tube is used for the transmitter of the anemograph. It suits the anemograph, as the pressure difference measured by it varies less with the variation of the wind direction than that measured by Dines' anemograph. The total and static pressures are conducted to the inside and outside of the metal belows of the recorder, respectively. The metal bellows extend the length in proportion to wind velocity instead of pressure difference by the action of curved levers. The scale of the recording chart is graduated linearly proportional to the wind velocity.
The wind direction is indicated by using a voltmeter which works as the wind vane moves a slider over the tops connected to resistances, the consecutive tops corresponding to 5 degress.