…This was due to weaknesses in the mechanical design and insufficient machining precision, which could not be solved with the technology of the time. Practical hand-cranked calculators were commercially produced in 1820 by Charles Xavier Thomas and in 1875 by Frank Stephen Baldwin. In Japan, Yato Ryoichi applied for a patent for a hand-cranked calculator based on his own concept, the Automatic Abacus, in 1902, and manufactured and sold several hundred units in the following few years. … *Some of the terminology that mentions "Thomas, CX" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…それは,機械設計上の弱点と加工精度の不十分さとに起因していて,当時の技術では解決できなかったのである。実用的な手回し計算機は,1820年にトーマスCharles Xavier Thomasや,75年にボールドウィンFrank Stephen Baldwinなどによって商業的に生産されるようになった。 日本では,1902年に矢頭良一が独自の構想による手回し計算機〈自働算盤〉を特許出願し,その後数年間に二百数十台を製造・販売した。… ※「Thomas,C.X.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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