https://www.youtube.com/watch?v=Zilvl9tS0Og

"A machine that generated sparks simply by rotating two discs"
- There are 19th-century instruments that are still regarded with respect today.
The image shows a Wimshurst machine manufactured by E. Ducretet in Paris.
Two large glass or ebonite discs rotate in opposite directions. Above them are metal sectors, collecting combs, Leyden jars, and two spheres that form the spark gap.
The crank is at the bottom. The assembly is mounted in a wooden box with glass panels. It works by electrostatic induction.
As the discs rotate, charges separate and accumulate until a spark jumps between the poles. It needs no magnets or coils. Only friction, geometry, and air as an insulator.
These machines were common in physics laboratories and public demonstrations in the late 19th and early 20th centuries.
They allowed for the study of discharges, ionization, and the early effects of high-voltage electricity in a visible and controlled manner. For years, while examining antique instruments, I was always struck by the mechanical elegance of the Wimshurst machine.
Everything is out in the open: the discs, the combs, the bottles. There are no hidden circuits. The phenomenon unfolds right before the observer's eyes.
Today, almost no one uses them for serious research.
However, they remain one of the best ways to understand, visually, how electrical charge behaves when forced to move. I sometimes imagine a future laboratory where these principles are studied again with new materials and modern sensors.
Not to repeat the past, but to remember that electricity can also be generated in very simple ways.
For now, the machine remains there, precisely drawn.
Ready to rotate.
Which part of this instrument do you find more ingenious: the discs or the charge accumulation system?