Schickard's "Calculating Clock"
"Schickard and his family did not survive the bubonic plague and his detailed notes remained unknown until discovered in 1935 and 1956 by historian Franz Hammer. Mathematician Bruno Von Freytag from the University of Tübingen used them to reconstruct the machine in 1960. One unit is in the Deutsches Museum in München." James Redin
Source: Picture taken by Eusebio Huélamo, Spain.

X-Number World