7/ The end of the 19th century saw the emergence of the two godfathers of language cartography, Georg Wenker, of Germany, and Jules Gilliéron, of Switzerland.
They were the first to place maps at the absolute front and centre of their atlases, and developed many of the key design and data collection principles used today.
Wenker's "Sprachatlas" lives on today in digital form at the University of Marburg: https://www.uni-marburg.de/en/fb09/dsa/projects/completed-projects/diwa