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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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After these, a special “remainder” rod is placed on the right. The following other wikis use this file: The popularity of Genaille’s rods was widespread but short-lived, as mechanical calculators soon began to displace manual arithmetic methods. Soon after their development by Genaille, the rulers were adapted to a set of rods that can perform division.

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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. Retrieved from ” https: The division rods are aligned similarly to genailpe-lucas multiplication rods, with the index rod on the left denoting the divisorand the following rods spelling out the digits of the dividend.


If the file has been modified from its original venaille-lucas, some details such as the timestamp may not fully reflect those of the original file. Fixed error in 7th column, from File: 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

By using this site, you agree to the Terms of Use and Privacy Policy. Public domain Public domain false false. On each strip is printed a column of triangles and a column of numbers:.

Description Genaille-Lucas rulers full. The device is a variant of Napier’s bones. Views View Edit History. 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.

Genaille–Lucas rulers – Wikipedia

In some countries this may not be legally possible; if so: This page was last edited on 17 Novemberat Consider multiplying by 4. The path of digits rulsrs with a number on the remainder rod, which is the remainder given by the division.


The product, shown in red, is Retrieved from ” https: Views Read Edit View history. I, the copyright holder of this work, release this work into the public domain. Genaille—Lucas rulers also known as Genaille’s rods are an ruelrs tool invented by Henri Genaillea French railway engineer, in From Wikimedia Commons, the free media repository. Then we simply read off the digits that we visited. The following 2 pages uses this file: The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Summary [ edit genallle-lucas Description Genaille-Lucas rulers full.

Genaille–Lucas rulers

Five rulers, one for each digit ofare arranged side-by-side, next to the “index” ruler:. Genaille, already known for having invented a number of arithmetic tools, created his rulers in the course of solving the problem.

This page was last edited on 7 Decemberat A full set of Genaille—Lucas rulers consists of eleven strips of wood or metal.

From Wikipedia, the free encyclopedia.