Genaille–Lucas rulers (also known as Genaille’s rods) is an arithmetic tool invented by Henri Genaille, a French railway engineer, in The following other wikis use this file: Usage on مساطر جينايل لوكاس. Usage on Genaille–Lucas rulers. Napier’s Bones and the Genaille-Lucas Rulers. Introduction. In , John Napier published Rabdologia, a book that contained a description of the rods that he.

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Genaille—Lucas rulers also known as Genaille’s rods are an arithmetic tool invented by Henri Genaillea French railway engineer, in From Wikimedia Commons, the free media repository. Views Read Edit View history. Then we simply read off fulers digits that we visited.

Napier’s Bones and the Genaille-Lucas Rulers

The following 2 pages uses this file: After these, a special “remainder” rod is placed on the right. Soon after their development by Genaille, the rulers were adapted to a set of rods that can perform division.

The path of digits ends with a number on the remainder rod, which rukers the remainder given by the division.

The quotient is read from left to right, following the lines from one rod to the next. By using this site, you agree to the Terms of Use and Privacy Policy.


I grant anyone the right to use this work for any purpose genaills-lucas, without any conditions, unless such conditions are required by law. I, the copyright holder of this work, release this work into the public domain.

From Wikipedia, the free encyclopedia. The product, shown in red, is The popularity of Genaille’s rods was widespread but short-lived, as mechanical calculators soon began to displace manual arithmetic methods. Retrieved from ” https: A full set of Genaille—Lucas rulers consists of eleven strips of wood or metal. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. Fixed error in 7th column, from File: Consider multiplying by 4.

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. By representing the carry graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations.

Napier’s Bones and the Genaille-Lucas Rulers

The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. The device is a variant of Napier’s bones. The following other wikis use this file: Views View Edit History. By using this site, you agree to the Terms of Use and Privacy Policy.


Five rulers, one for each digit ofare arranged side-by-side, next to the “index” ruler:. Public domain Public domain false false. Summary genaillf-lucas edit ] Description Genaille-Lucas rulers full.

File:Genaille-Lucas rulers full.pdf

Genaille, already known for having invented a number of arithmetic tools, created his rulers in the course of solving the problem. On each strip is printed a column of triangles and a column of numbers:. Retrieved from ” https: In some countries this may not be legally possible; if so: The division rods are aligned similarly to the multiplication rods, with the index rod on the left denoting the divisorand the following rods spelling out the digits of the dividend.