Thinking about Machines and Thinking Share In Paris. Exactly Seventy Years Ago. He likely arrived in Paris from Darmstadt, Germany, by train that January, exactly seventy years ago. At 53, and a full professor of applied mathematics and the founding director of the Institut für Praktische Mathematik at the Technische Hochschule Darmstadt, Alwin Walther was among Germany’s leading figures in computation. The calculational prowess of Walther and his Institut–employing all manner of manual, mechanical, and electromechanical approaches–had attracted the attention, and the support, of the Nazi regime during the Second World War. But as Walther made his way to the academic heart of liberated Paris, the Latin Quarter, few passersby would have guessed at this background.