Mount Vesuvius' crater, Kingdom of Naples, 1767.

Hand-coloured etching by Peter Fabris (active 1768-1779). Illustrated plate from William Hamilton's study of Italian volcanoes, 'Campi Phlegraei' (published in Naples, 1776). Images show the increase of the 'little mountain' in the crater of Vesuvius from 8th July to the 29th October 1767. Image seven illustrates the state of the crater after the great eruption of 1767, with the distance between points B and F showing an increase of about 200 feet in height. Hamilton's book was a more precise study of volcanoes than had previously existed.