My grandfather, when he was a boy in the 1910s or 1920s built a radio out of a round oatmeal box, copper wire, and a crystal. I never saw the original, but he b

My grandfather, when he was a boy in the 1910s or 1920s built a radio out of a round oatmeal box, copper wire, and a crystal. I never saw the original, but he built a replica of it (featured in a book in the 1970s) that I saw as a child. https://sg30p0.familysearch.org/service/records/storage/dascloud/patron/v2/TH-7771-104446-17278-18/dist.jpg https://sg30p0.familysearch.org/service/records/storage/dasc...