Leibniz calculator hi-res stock photography and images - Alamy
Stepped reckoner - Wikipedia
Deutsches Museum on Twitter: "Calculator of Gottfried Wilhelm #leibniz @DeutschesMuseum : The famous #polymath was born in Leipzig 370 years ago. https://t.co/mDa4vZ6VNQ" / Twitter
In the 17th Century, Leibniz Dreamed of a Machine That Could Calculate Ideas - IEEE Spectrum
October 30 2009, Berlin, replica of the calculating machi… | Flickr