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compasso di propozione

compasso di propozione

La macchina calcolatrice di Wilhelm Schickard realizzata nel 1623 dallo scienziato tedesco era in grado di eseguire sottrazioni e addizioni fino a 6 cifre. The sketch from the Württembergischen Landesbibliothek in Stuttgart

La macchina calcolatrice di Wilhelm Schickard realizzata nel 1623 dallo scienziato tedesco era in grado di eseguire sottrazioni e addizioni fino a 6 cifre. The sketch from the Württembergischen Landesbibliothek in Stuttgart

In late 1650s  Kircher was asked to prepare a set of mathematical tools for teaching the young Austrian crown prince (Archduke) Karl Joseph  (1649-1664). The order was fulfilled and a set of ten different tools of bone-like tablets for performing a variety of different tasks was manufactured  (Istituto e museo di storia della scienza, Florence, Italy). The toolset (called Organum Mathematicum, Mathematische Orgel or cista) was placed in a veneered wooden chest with a hinged lid.

In late 1650s Kircher was asked to prepare a set of mathematical tools for teaching the young Austrian crown prince (Archduke) Karl Joseph (1649-1664). The order was fulfilled and a set of ten different tools of bone-like tablets for performing a variety of different tasks was manufactured (Istituto e museo di storia della scienza, Florence, Italy). The toolset (called Organum Mathematicum, Mathematische Orgel or cista) was placed in a veneered wooden chest with a hinged lid.

illustrated page of the abacus from p.819 of Opera historica et philologica, 1682, by Marcus Welser.

illustrated page of the abacus from p.819 of Opera historica et philologica, 1682, by Marcus Welser.

Adam riesen

Adam riesen

compass from the 16th or 17th century

compass from the 16th or 17th century

Bagua (the Eight Diagrams) abacus of the Ming Dynasty (1368-1644) in Huizhou County, east China's Anhui Province July 17, 2006. This 50 digit abacus is approximately 30cm (11.8 inches) in diameter and allows the operator to shift the decimal point in either direction.

Bagua (the Eight Diagrams) abacus of the Ming Dynasty (1368-1644) in Huizhou County, east China's Anhui Province July 17, 2006. This 50 digit abacus is approximately 30cm (11.8 inches) in diameter and allows the operator to shift the decimal point in either direction.

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