Vintage Rotating Vane Anemometer Turbine

This wonderful looking antique scientific instrument is a 4.5-inch Vintage Rotating Vane Anemometer Turbine. I can't find a maker's mark.

It has 8 vanes and is a sensing head only, where the speed of revolution is measured by an optical system based on a torch bulb and voltage dependent resistor.  This measurement is then converted to wind speed using a suitable external meter, (not included), attached via the three pin plug and screw fitment. 

Made of hammered finish painted brass with Aluminium vanes, this is both a useful industrial measuring tool and an aesthetic beauty.

Approximate Size:

• Diameter of Anemometer: 11.5cm / 4.5"
  
• Max. Depth: 8.5cm

The brass is visible in a few places where the coating has been removed. There are surface scuffs and scratches commensurate with age and use. 

Also known as a Wind / Air Speed Flow Meter, it would have been used on, for example, an airfield. Other versions were also extensively used in mines.

Please click on the following links for more meteorological instruments.