Logarithmic calculating drum. Zürich Daemen-Schmid... Lot 475
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Logarithmic calculating drum. Zürich Daemen-Schmid ca. 1925 Aluminum drum, 60,5 x 17,5 cm, with slotted cylindrical sleeve, signed "Loga Calculator 15m Patente Daemen-Schmid Uster-Zürich"; the drum covered with paper marked with logarithmic scales (sl. used, paper rubbed and stained). Without supporting aluminium frame. Ref. Smithsonian.
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