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Accession number;04A0786996
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| Title;A Bi-Qinary Mechanical Calculating Machine Invented by Ryoichi Yazu |
| Author;
YAMADA AKIHIKO
(Tokyo Denki Univ.)
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Journal Title;Papers of Technical Meeting on History of Electrical Engineering, IEE Japan
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Journal Code:L1055A
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ISSN:
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VOL.HEE-04;NO.9-12;PAGE.19-22(2004)
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| Figure&Table&Reference;FIG.1, REF.8 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Ryoichi Yazu developed a mechanical calculating machine in 1902 and got a patented for it in 1903. The macnine was made of medal and was based on bi-quinary system, the principle of Soroban (abacus.) He named the product "Patent Yazu Arithmometer", manufactured about 200 units in Tokyo and sold them. The unit price was 200 yen at that time. He met Ogai Mori in Kokura, Kyushu when he was developing his machine. Mori introduced him to professors of University of Tokyo. When Yazu died at the age of 31, Mori sent him words regretting his early grave. Mori also wrote his meeting with Yazu in 1901 in his diary "Kokura Nikki". One machine was found in 1977 in the house of Yazu's sister descendants by Akira Uchiyama. This machine is exhibited at National Science Museum Tokyo until October 11, 2004. (author abst.) |
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