You searched for: “keraunograph
ceraunograph, keraunograph (s) (noun); ceraunographs, keraunographs (pl)
1. An instrument for chronologically recording occurrences of thunder (thunderstorms) and lightning (lightnings or thunderbolts).
2. A figure impressed by lightning upon a body or material.
3. In meteorology, an apparatus, consisting essentially of an antenna connected to a galvanometer or electroscope, for recording the occurrences of thunderstorms.