475. [Mathematics]

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.

€ 180 / 250

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