"Edouard Branly invented the first real detector of radio waves, the coherer." https://medium.com/however-mathematics/the-emergence-of-calculus-a-mathematical-journey-of-human-thought-303dd0839b0a
Coherer, a storm detector. Using a short antenna, it detects discharges from an electrostatic machine. A replica of my own design. The inventor was the French physicist Edouard Branly in 1890.