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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Then we simply read off the digits that we visited. The following other wikis use this file: The timestamp is only as accurate as the clock in the camera, and it may be completely wrong. In some countries this may not be legally possible; if so: The popularity of Genaille’s genaille-licas was widespread but short-lived, as mechanical calculators soon began to displace manual arithmetic methods.

Genaille–Lucas rulers

After these, a special “remainder” rod is placed on the right. A full set of Genaille—Lucas rulers consists of eleven strips of wood or metal. By representing the carry graphically, the user can genaklle-lucas off the results of simple multiplication problems directly, with no intermediate mental calculations.


On each strip is printed a column of triangles and a column of numbers:. The device is a variant of Napier’s bones.

Retrieved from ” https: Description Genaille-Lucas rulers full. 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.

I grant anyone grnaille-lucas right to use this work for any purposewithout any conditions, unless such conditions are required by law. Retrieved from ” https: From Wikimedia Commons, the free media repository. This page was last edited on 7 Decemberat Consider multiplying by 4.

Genaille—Lucas rulers also known as Genaille’s rods are an arithmetic tool invented by Henri Genaillea French railway engineer, in By using this site, you agree to the Terms of Use and Privacy Policy.

The product, shown in red, is The following 2 pages uses this file: If the file has been modified from its original state, some details such as the timestamp may not fully reflect genaille-lycas of the original file.

This page was last edited on 17 Novemberat The path of digits ends with a number on the remainder rod, which is the remainder egnaille-lucas by the division. Views Read Edit View history. Views View Edit History. The quotient is read from left to right, following the lines from one rod to the next.


Applet: Genaille-Lucas Rulers for Division

Genaille, already known for having invented a number of arithmetic tools, created his rulers in the course of solving the problem. Soon after their development by Genaille, the rulers were adapted to a set of rods that can perform division.

From Wikipedia, the free encyclopedia. Summary [ edit ] Description Genaille-Lucas rulers full. Five rulers, one for each digit ofare arranged side-by-side, next to the “index” ruler:. Fixed error in 7th column, from File: This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software genaille-lucaw used to create or digitize it.

File:Genaille-Lucas rulers – Wikimedia Commons

I, the copyright holder of this work, release this work into the public domain. Public domain Public domain false false. By using this site, you agree to the Terms of Use and Privacy Policy.