The Japanese Abacus: Its Use and Theory

The Japanese Abacus: Its Use and Theory

The Japanese Abacus: Its Use and Theory

The Japanese Abacus: Its Use and Theory

Excerpt

It gives me great pleasure that this book in English on the abacus is ready for publication. Japanese abacus operators have long cherished the desire, here finally realised, of introducing the Japanese abacus to other countries in view of the remarkable advances and developments which have been made in the instrument and its use during the past quarter of a century.

The Japanese abacus, simple and primitive looking though it be, can be operated with greater speed and efficiency than even the electric calculating machine--a fact proven in numerous tests and well documented by Mr. Kojima in his first chapter. This is particulary so in addition and subtraction, where the abacus can handle figures of any number of digits twice as fast as the electric machine. To explain the instrument's incredible speed and mystifying efficiency it is essential not only to introduce the newest improved methods of operation but also to elucidate the most advanced theories of rational bases and of bead manipulation.

In writing this practical book Mr. Kojima has kept these two requirements well in mind. The Abacus Research Institute of the Japan Chamber of Commerce and Industry has been most pleased to cooperate with him by making available its research data and correcting his manuscript in the light of all the latest information.

YOEMON YAMAZAKI Vice-Chairman, Abacus Research Institute Professor of Economics, Nippon University Vice-President, All-Japan Federation of Abacus Operators . . .

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