Diagrams used by Professor Angelos G Galanopoulos to substantiate his claim that he had found the Lost City of Atlantis. Galanopoulos, chief of the seismological Institute in Athens, addressed the 12th General Assembly of the International Union of Geodesy and Geophysics. According to Galanopoulos, the city was in a group of islands in the Cyuclades centred around the Santorini Volcano. The diagrams were drawn up from the description in Plato's Kritias. - 8th October 1960