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- Reactance Coil, Used at Hammond Radio Research Laboratory, 1915-1920 - John Hays Hammond, Jr., is considered "the father of radio control." In 1926, he built a medieval-inspired castle in Gloucester, Massachusetts, as his home and research laboratory. With 400 patents to his name, Hammond developed radio control, autopilot function, and targeted missile detonation. A reactance coil is an inductor, blocking high-frequency AC power, allowing low-frequency DC power to pass.

- 1915-1920
- Collections - Artifact
Reactance Coil, Used at Hammond Radio Research Laboratory, 1915-1920
John Hays Hammond, Jr., is considered "the father of radio control." In 1926, he built a medieval-inspired castle in Gloucester, Massachusetts, as his home and research laboratory. With 400 patents to his name, Hammond developed radio control, autopilot function, and targeted missile detonation. A reactance coil is an inductor, blocking high-frequency AC power, allowing low-frequency DC power to pass.
- Hammond Radio Signaling System, Type S, 1918-1920 - John Hays Hammond, Jr., was largely responsible for launching the field of radio control. In 1926, he built a medieval-inspired castle in Gloucester, Massachusetts. This site served as his home and research laboratory. With over 400 patents to his name, Hammond developed ideas for radio control, autopilot function, and targeted missile detonation. This device was used in Hammond's laboratory.

- 1918-1920
- Collections - Artifact
Hammond Radio Signaling System, Type S, 1918-1920
John Hays Hammond, Jr., was largely responsible for launching the field of radio control. In 1926, he built a medieval-inspired castle in Gloucester, Massachusetts. This site served as his home and research laboratory. With over 400 patents to his name, Hammond developed ideas for radio control, autopilot function, and targeted missile detonation. This device was used in Hammond's laboratory.