EGLI, Hans W. (firm of). Calculating machine "MADAS." Zurich, 1915. 8 o. Unbound brochure. In 1878 Ramón Verea patented a calculating machine that used a partial product multiplying mechanism capable of "reading" values from a notched Pythagorean multiplication table. In 1887 the French inventor Léon Bollée, using a similar principle, built a calculating mechanism capable of performing multiplication directly instead of by repeated addition. Neither Verea nor Bollée produced their machines commercially, but in 1893 Otto Steiger of Munich patented a calculator based on Bollée's approach, which was manufactured between 1895 and 1935 by the firm of Hans W. Egli of Switzerland and marketed under the name of "Millionaire." "[The machine's] principal advantage consist[ed] in the simplicity and rapidity with which multiplications, divisions, square roots, and compound rules may be treated" (Horsburgh 1982, 117), thus making it ideal for more complex accounting operations. Forty-six hundred "Millionaires" were sold, primarily in Europe. The machine was manufactured in both lever and keyboard models, some of which weighed as much as 120 pounds (Redin 1999). OOC 288. When OOC was written OCLC cited no copies of this or the following two pamphlets included here: EGLI, Hans W. (firm of). "The Millionaire." "Millionär." "La Millionnaire" [cover title] Zurich, 1915. 8 o. Original green printed wrappers. Advertising brochure printed in English, German, and French, describing several models of the "Millionaire." OOC 289. -- [EGLI, Hans W. (firm of).] Adam Hilger Ltd. The Millionaire calculating machine [cover title]. Zurich, 1915. 8 o. Original gray printed wrappers. Advertising brochure describing the Millionaire's unique features, and including instructions for its use. OOC 290.
EGLI, Hans W. (firm of). Calculating machine "MADAS." Zurich, 1915. 8 o. Unbound brochure. In 1878 Ramón Verea patented a calculating machine that used a partial product multiplying mechanism capable of "reading" values from a notched Pythagorean multiplication table. In 1887 the French inventor Léon Bollée, using a similar principle, built a calculating mechanism capable of performing multiplication directly instead of by repeated addition. Neither Verea nor Bollée produced their machines commercially, but in 1893 Otto Steiger of Munich patented a calculator based on Bollée's approach, which was manufactured between 1895 and 1935 by the firm of Hans W. Egli of Switzerland and marketed under the name of "Millionaire." "[The machine's] principal advantage consist[ed] in the simplicity and rapidity with which multiplications, divisions, square roots, and compound rules may be treated" (Horsburgh 1982, 117), thus making it ideal for more complex accounting operations. Forty-six hundred "Millionaires" were sold, primarily in Europe. The machine was manufactured in both lever and keyboard models, some of which weighed as much as 120 pounds (Redin 1999). OOC 288. When OOC was written OCLC cited no copies of this or the following two pamphlets included here: EGLI, Hans W. (firm of). "The Millionaire." "Millionär." "La Millionnaire" [cover title] Zurich, 1915. 8 o. Original green printed wrappers. Advertising brochure printed in English, German, and French, describing several models of the "Millionaire." OOC 289. -- [EGLI, Hans W. (firm of).] Adam Hilger Ltd. The Millionaire calculating machine [cover title]. Zurich, 1915. 8 o. Original gray printed wrappers. Advertising brochure describing the Millionaire's unique features, and including instructions for its use. OOC 290.
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