Why a 1923 patent sale made this Gloucester inventor filthy rich

Hammond’s Revolutionary Radio Control Experiments at Gloucester

John Hammond Jr. built a lab on his dad’s Gloucester estate in 1911, fresh out of Yale.

By 1912, Army brass watched in awe as he guided a boat by radio from shore.

Then in 1914, his unmanned yacht "Natalia" sailed 120 miles round-trip from Gloucester to Boston, thanks to his "Gyrad" system with a gyroscope.

Soon after, Hammond crafted anti-jamming tech and systems that let ships track enemy lights. His big break came in 1923 when RCA bought 81 of his patents for a small fortune.

The Hammond Castle Museum in Gloucester now stands as a testament to the man who put remote control on the map.

Yale Engineer Built His Dream Lab on Rocky Massachusetts Shore

John Hammond Jr. got his engineering degree from Yale in 1910.

Just a year later, he built the Hammond Radio Research Laboratory on his rich dad’s property in Gloucester, Massachusetts. The lab sat on rocky coastline, giving Hammond the perfect spot to test his radio experiments.

This location let him test radio signals over water, which helped his work in remote control technology that soon caught the military’s eye.

First Boat Tests Caught Army’s Eye in 1912

Hammond tested controlling boats with radio signals in Gloucester Harbor. In 1912, he invited the Army’s Coast Artillery chief to watch one of his demos.

The military man saw Hammond control a boat from shore, moving it forward, backward, and turning it without anyone on board.

Army officials quickly saw how this could work in war, especially for unmanned boats that could carry bombs or gather info without putting soldiers at risk.

His Gyrad System Kept Unmanned Vessels on Course

Early remote control had one big problem: keeping vehicles on a steady path.

Hammond fixed this by creating the "Gyrad" system in 1913, which mixed radio control with gyroscope technology. The gyroscope kept boats stable and on course even in rough waters or changing winds.

This breakthrough allowed exact steering of unmanned vessels over long distances. The Gyrad became the base for all modern guidance systems.

Unmanned Yacht Made Historic 120-Mile Journey

Hammond showed off his tech in 1914 when his unmanned yacht "Natalia" sailed 120 miles from Gloucester to Boston and back.

The boat moved through harbor traffic, followed the coast, and returned home with no one on board. This trip marked the first major self-driving vehicle journey in history.

Naval officers who watched realized they were seeing warfare’s future, where boats could complete missions without risking sailors’ lives.

Secret Frequencies Stopped Enemy Signal Hijacking

Hammond realized enemies could take over his radio-controlled boats by sending interference signals. He solved this by creating secure transmission frequencies that resisted jamming.

His system used multiple frequency bands that switched automatically if someone tried to interfere. Hammond also created coded radio signals that only his receivers could understand.

These security features became standard in military communications.

Boats That Hunted Enemy Searchlights Changed Naval Warfare

Hammond created a target-seeking system that let boats find enemy searchlights on their own. His boats carried light-sensitive cells that spotted and tracked bright lights, then steered toward them.

This turned boats into self-operating weapons that could find targets without human help.

Hammond tested these systems in Gloucester harbor, showing they could locate light sources from over a mile away, even in fog.

Radio-Controlled Torpedo Traveled Over 5 Miles Underwater

Hammond adapted his radio control tech to naval torpedoes with great success.

In one test, he guided a modified torpedo through a 9,000-yard run (over 5 miles) while it stayed 12 feet underwater. The torpedo followed radio commands to change course and speed throughout its journey.

This achievement changed naval warfare by allowing weapons to be guided to targets with great accuracy, cutting down the number of torpedoes needed to sink enemy ships.

Entire Battleship Operated by Remote Control in 1921

Hammond’s technology reached new heights in 1921 when he showed remote control of a whole battleship cruising in Chesapeake Bay.

Military officials watched as the massive ship moved, turned, and fired weapons with no sailors on board.

The technical challenges were huge, needing powerful transmitters and complex control systems to run the ship’s engines, rudder, and weapons.

Naval commanders saw this would change warfare by allowing dangerous missions without risking crews.

Radio Corporation of America Paid Big for His Patents

Hammond struck gold in 1923 when Radio Corporation of America bought 81 of his radio patents. The deal earned him $125,000 plus 70,000 shares of RCA stock during the early radio boom, making him rich on his own.

These patents covered basic radio technologies that became key to the growing broadcast industry. RCA saw the value of Hammond’s inventions for commercial radio, even though he created many mainly for military use.

Variable-Pitch Propellers Adapted to Changing Water Conditions

During World War II, Hammond kept creating new technologies for the military.

One key invention was variable-pitch propellers for navy ships that automatically adjusted to changing water conditions.

These propellers changed their blade angles based on water resistance, keeping optimal speed and efficiency no matter the sea state.

The technology improved fuel efficiency and reduced engine wear during long ocean trips, giving Allied ships greater range during the war.

Modern Missiles Still Use Hammond’s Core Principles

The guidance systems in today’s smart weapons trace directly back to Hammond’s laboratory work.

His innovations established the four fundamental principles still used in guided missiles: stabilizing systems that keep weapons on course, security features that prevent enemy interference, proximity sensors that detect when they’re near targets, and homing systems that actively seek targets.

Every guided missile fired today, from air-to-air weapons to long-range cruise missiles, relies on these core principles first developed in that rocky Gloucester laboratory over a century ago.

Visiting Hammond Castle Museum, Gloucester

Hammond Castle Museum at 80 Hesperus Ave in Gloucester showcases John Hays Hammond Jr. ‘s radio control experiments that created modern remote control technology.

You can visit daily from 9am to 3:30pm with guided tours covering his Laboratory, Great Hall and War Room displays of military innovations like guided torpedo technology.

Adult tickets cost $20-25, seniors $17, kids 5-12 pay less, and under 4 get in free. Self-guided tours are also available.

This article was created with AI assistance and human editing.

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