The volcanologist 𝗙𝗿𝗮𝗻𝗸 𝗔𝗹𝘃𝗼𝗿𝗱 𝗣𝗲𝗿𝗿𝗲𝘁 listening with the help | ᐯᗴՏᑌᐯIO ᗩᖇT ՏᑕIᗴᑎᑕᗴ TOᑌᖇIՏᗰ

The volcanologist 𝗙𝗿𝗮𝗻𝗸 𝗔𝗹𝘃𝗼𝗿𝗱 𝗣𝗲𝗿𝗿𝗲𝘁 listening with the help of a selfmade geophone to the whispers of volcanic activity in the Campi Flegrei, Italy, probably in 1906-1907. A cable can be seen in front of his face connecting the geophone to a loudspeaker positioned on his ear, in the other hand he holds a battery or control device.
Photo from "The Day’s Work of a Volcanologist." The World’s Work, V. 25, November, 1907.


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