CROOKE’S RADIOMETER WITH HIGH VOLTAGE ELECTRODES

A radiometer contains a partial vacuum and has vanes which spin on a spindle when exposed to intense light. Invented in 1873 by Sir William Crooke.  This version is on a turned wood base and has electrodes which, when attached to a power source, emit colorful “lightning” effect to the interior of the bulb. Vintage. 

6” x 5” x 9”