If you are a ham radio operator of a certain age, you probably remember ads for “The Instructograph,” a mechanical device for learning Morse code. [Our Own Devices] has an ancient specimen of the ...

Jul 15, 2025 Jul 15, 2025 Updated Jul 16, 2025 Carter Martone couldn’t wait to show his dad how his Morse code transmitter worked. The simple device he built during Camp Invention in Merrimack last ...