Seventy years ago this month, the May 1956 issue of Popular Electronics showed these ideas for an emergency radio receiver. If the power was out, or the radio otherwise out of commission, the emergency adapter was simply placed near the loop antenna. Inductively coupled, it would use the set’s tuning circuit, and you could hear it through headphones. Three versions were shown. The cigar box version had the advantage of furnishing a place to store the headphones. Another one used a loop antenna from a broken radio, and the third variation had the coil taped permanently in place on the outside of the radio.