Woltmann wing

Woltman wing, a mobile flow measuring device made of brass in a box covered with black leather (Museum for Hamburg History)

A Woltmann wing (also called Woltmann wing ) is an instrument developed by Reinhard Woltman around 1790 to determine the speed of flowing water .

Like the axis of the windmill by the pressure of the wind, the axis of the small wheel , mostly made of brass and equipped with crooked blades , is rotated faster or slower depending on the pressure of the water. The flow rate of the water can be determined from the number of revolutions carried out in a certain time unit, which are measured by a counter. The device is held under water on a vertical rod and is positioned by a small sheet metal plate so that the axis opposes the flow .

The principle of the Woltmann wing is still used today in determining the amount of water using Woltmann meters .

source

Brockhaus' Konversationslexikon (14th edition) . FA Brockhaus in Leipzig, Berlin and Vienna 1894–1896
Friedrich L. Brand: Water measurement with the Woltmann wing . In: Technikgeschichte, Vol. 59 (1992), No. 2, pp. 133-155.

Web links

Historical anemometer - Woltmannsche wing "Wing of Tangermünde". In: geag.de. Retrieved July 24, 2015 .