https://gizmodo.com/build-the-spirit-radio-that-creeped-out-tesla-himself-5390059?utm_medium=sharefromsite&utm_source=_facebook&fbclid=IwAR0MW-4vUfiFrWVI2sWGSB3DDUADI4-2iV4wQj_dTvuKhXXHdfC4rqn53fI Tesla’s Spirit Radio uses a simple crystal radio circuit connected to a computer sound-in jack…
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Thomas Edison's adventures with creating a spirit phone.
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