Tchebyshev 1882

source: Andrew Butko (http://commons.wikimedia.org/wiki/File:Арифмометр.jpg)

source: Mechanisms by Tchebyshev

source: Mechanisms by Tchebyshev

source: Mechanisms by Tchebyshev

device for multiplication

source: Mechanisms by Tchebyshev

source: Mechanisms by Tchebyshev

source: Mechanisms by Tchebyshev

last updated: 24-Jan-12