Genaille–Lucas rulers

The topic of Genaille–Lucas rulers is one that has sparked interest and debate for a long time. Over the years, it has become an object of study, analysis and reflection for experts and lovers of the subject. Genaille–Lucas rulers has been the subject of multiple investigations and its relevance in today's society is indisputable. In this article, we will explore different perspectives and approaches related to Genaille–Lucas rulers, delving into its most relevant aspects and offering a complete and updated vision of this exciting topic.

A complete set of Genaille–Lucas rulers, including an additional index rod.

Genaille–Lucas rulers (also known as Genaille's rods) are an arithmetic tool invented by Henri Genaille, a French railway engineer, in 1891. The device is a variant of Napier's bones. By representing the carry graphically, the user can read off the results of simple multiplication problems directly, with no intermediate mental calculations.

History

In 1885, French mathematician Édouard Lucas posed an arithmetic problem during a session of the Académie française. Genaille, already known for having invented a number of arithmetic tools, created his rulers in the course of solving the problem. He presented his invention to the Académie française in 1891. The popularity of Genaille's rods was widespread but short-lived, as mechanical calculators soon began to displace manual arithmetic methods.[1]

Design

A full set of Genaille–Lucas rulers consists of eleven strips. On each strip is printed a column of triangles and a column of numbers.

Multiplication

By arranging the rulers in the proper order, the user can find unit multiples of short natural numbers by sight.

Division

Genaille–Lucas rulers for division indicate their paths with lines, not arrows.

Soon after their development by Genaille, the rulers were adapted to a set of rods that can perform division. The division rods are aligned similarly to the multiplication rods, with the index rod on the left denoting the divisor, and the following rods spelling out the digits of the dividend. After these, a special "remainder" rod is placed on the right. The quotient is read from left to right, following the lines from one rod to the next. The path of digits ends with a number on the remainder rod, which is the remainder given by the division.

Resources

See also

References

  1. ^ Williams, Michael R. (1990). "Chapter 1: Early Calculation" (PDF). In Aspray, William (ed.). Computing Before Computers. Ames: Iowa State University Press. pp. 20–23. ISBN 0-8138-0047-1.

Further reading