# GENAILLE-LUCAS RULERS 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: Multiplication[ edit ] By arranging these rulers in the proper order, the user can solve multiplication problems. Consider multiplying by 4. Five rulers, one for each digit of , are arranged side-by-side, next to the "index" ruler: The second multiplicand is 4, so we look at the fourth row: We start from the top number in the last column of the selected row: The grey triangle points the way to the next number: We follow the triangles from right to left, until we reach the first column.

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Mitaur Summary [ edit ] Description Genaille-Lucas rulers full. The path of digits ends with a number on the genaiple-lucas rod, which is the remainder given by the division. From Wikimedia Commons, the free media repository. The quotient is read from left to right, following the lines from one rod to the next.

Genaille—Lucas rulers 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. Views Read Edit View history. 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.

This page was last edited on 17 Novemberat Then we simply read off the digits that we visited. On each strip is printed a column of triangles and a column of numbers:. File:Genaille-Lucas rulers full. Views View Edit History. Soon after their development by Genaille, the rulers were adapted to a set of rods that can perform division. Genaille—Lucas rulers also known as Genaillel-ucas rods are an arithmetic tool invented by Henri Genaillea French railway engineer, in Consider multiplying by 4.

Genaille, already known for having invented a number of arithmetic tools, created his rulers in the course genaille-lkcas solving the problem. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Genaille—Lucas rulers — Wikipedia This page was last edited on 7 Decemberat The following other wikis use this file: Description Genaille-Lucas rulers full. Fulers some countries this may not be legally possible; if so: A full set of Genaille—Lucas rulers consists of eleven strips of wood or metal. Related Posts

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## Napier's Bones and the Genaille-Lucas Rulers

Nezahn The path of digits ends with a number on the remainder rod, which is the remainder given by the division. By representing the gnaille-lucas graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations. Genaille—Lucas rulers I, the copyright holder of this work, release this work into the public domain. The timestamp is only as accurate as the clock in genaille-pucas camera, and it may be completely wrong. Soon after their development by Genaille, the rulers were adapted to a set of rods that can perform division.

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## Watch how 19th-century Genaille-Lucas calculating rulers work

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