Whole Number Factored by Automatic Calculator

The discovery of the device was at the Observatoire du Bordeaux, located in Floirac, France, it was found, (hidden away for some 50 years) by the following people in 1993:

  • Hugh C. Williams, University of Manitoba, Winnipeg, Manitoba, Canada
  • Jeffrey Shallit, University of Waterloo, Waterloo, Ontario, Canada
  • Francois Morain, Ecole Polytechnique, Palaiseu, France

What they had found in 1993 was called Machine a Congruences built in 1919. This device would take whole numbers and factor them into their prime factors. This machine was the creation of a french mathematician by the name of Eugene Oliver Carisson, a military officer in his time.

The Brass device works like this, a crank connected to a set of nested horizontal “Congruence Rings”, pegs carefully positioned on the rings would give the solution to a problem when the crank was turned. The answer could then be read by the armature on the top of the rings.

      Hugh C. Williams,
      Jeffrey Shallit,
      Francois Morain
      Discovery of device
      Machine a Congruences
Inventor: Eugene Oliver Carisson
      Mathematician, Military Officer

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