I recently learned that the US Navy was installing crystal radios in ships as late as 1942. And why not? With one, the ship could still receive AM voice or Mo

I recently learned that the US Navy was installing crystal radios in ships as late as 1942. And why not? With one, the ship could still receive AM voice or Morse code even it it lost all electrical power. https://californiahistoricalradio.com/wp-content/uploads/2023/02/MacKay-Maritime-Crystal-Set.pdf https://californiahistoricalradio.com/wp-content/uploads/202...