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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The following 2 pages uses this file: The product, shown in red, is 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. Public domain Public domain false false. Genaille, already known for having invented a number of arithmetic tools, created his rulers in the course of solving the problem.

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Napier’s Bones and the Genaille-Lucas Rulers

From Wikimedia Commons, the free media repository. Retrieved from ” https: Description Genaille-Lucas rulers full.


From Wikipedia, the free encyclopedia. The timestamp genajlle-lucas only as accurate as the clock in the camera, and it may be completely wrong.

Summary [ edit ] Description Genaille-Lucas rulers full.

Then we simply read off the digits that we visited. This page was last edited on 17 Novemberat Retrieved from ” https: Fixed error in 7th column, from File: By using this site, you agree to the Terms of Use and Privacy Policy.

The following other wikis use this file: Consider multiplying by 4.

The quotient is read from left to right, following the lines from one rod to the next. 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.

Soon after their development by Genaille, the rulers were adapted to a set of rods that can perform division. A full set of Genaille—Lucas rulers consists of eleven strips of wood or metal.

The gfnaille-lucas of digits ends with a number on the remainder rod, which is the remainder given by the division. Genaille—Lucas rulers also known as Genaille’s rods are an arithmetic tool invented by Henri Genaillea French railway engineer, in Views View Edit History. The popularity of Genaille’s rods was widespread but short-lived, as mechanical calculators soon began to displace manual arithmetic methods.


Five rulers, one for each digit ofare arranged side-by-side, next to the “index” ruler:.

Applet: Genaille-Lucas Rulers for Division

On each strip is printed a column of triangles and a column of numbers:. By representing the carry graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations. After these, a special “remainder” rod is placed on the right. Views Read Edit View history.

Genaille–Lucas rulers

The device is a variant of Napier’s bones. 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. I grant anyone the right to use this work for any purposewithout any conditions, unless such conditions are required by law. This page was last edited on 7 Decemberat