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Charles Babbage Institute Reprint

This first English translation of Napier's Rabdologia provides a clear and readable introduction to a group of physical calculating devices, which, long overshadowed by Napier's logarithms, have their own intrinsic interest and charm.

Graphical and Mechanical Methods for Simplifying Calculation

This first translation of d'Ocagne's Le Calcul Simplifié makes a classic work on the early art of computation available to historians of computer science.