Wimshurst Influence Machine

Invented by British inventory, James Wimshurst, between 1880-1883. An electrostatic generator that develops high voltage, it as 2 counter rotating discs mounted vertically and 2 bars with brushes that rub against evenly spaced metallic strips mounted on each of the discs.  

Static electricity is produced when the discs rotate. This is stored in 2 lyden jars. Two electrodes leading from these lyden jars can be moved and the distance between them varied.
Once the charge is great enough, a visible spark will flow from one electrode to the other. By lengthening the distance between these electrodes, the charge will eventually increase and a longer spark will occur. The air space between electrodes allows for varying spark length.
Due to electrostatic repulsion, the shorter the airspace between electrodes will create a more frequent but smaller spark. The larger the airspace between them will create a larger, less frequent spark.
This particular machine is made of brass and glass over a painted metal base. Early 20th Century (circa 1920). German made.  Marked what appears ‘20 03’ on underneath metal base. While one lyden jar is slightly compromised, the device is still operable. Sold as is. 

Weight: 5 lbs. 11 oz. 

Dimensions: 9.5” x 6.0” x 11.50”