At Burlington House
Ben Walker: William Smith’s Geological Maps, 7 January 2021
“... drew his coloured strata directly onto a base map, made in 1794 by his publisher, the cartographer John Cary, before the fifteen sheets were engraved by assistants onto copper plates ready for reprinting – a process that took two years. He made several versions of the map during his lifetime, many of which he neither numbered nor named. Some of these ... ”