Nikola Tesla's Remote Control System for Boats

Nikola Tesla's 1898 patent for controlling a boat's movement and steering from a distance using radio waves and electrical signals.

What it covers

This patent describes a system for controlling a vessel from a remote location using electromagnetic waves. A receiver on the boat detects these waves, which trigger a sensitive device—a cylinder filled with metal grains—to activate internal relays. These relays then control electric motors that handle the vessel's propulsion and rudder position. The system uses a clockwork mechanism to reset the receiver after each signal, ensuring it remains ready for the next command.

What it doesn't cover

• —Does not cover modern digital radio communication protocols like Bluetooth or Wi-Fi.
• —Does not cover autonomous navigation systems that rely on GPS or onboard sensors.
• —Does not cover systems that use infrared light for signaling.
• —Does not cover software-based control algorithms.

The clever bit

Tesla used a 'coherer'—a cylinder of metal grains—as a radio receiver that could be physically shaken or rotated by clockwork to reset it, allowing it to detect a new signal after each command.

Why it matters

This patent is a foundational document for the field of telemechanics, or remote control. Tesla famously demonstrated this technology in 1898 at Madison Square Garden with a radio-controlled boat, shocking the public who believed it was magic or a trained animal inside the hull.

Real-world examples

• 1.Radio-controlled model boats
• 2.Early remote-controlled torpedoes
• 3.Foundational concepts for modern drones