Gebrüder Wichmann Berlin Rechenuhr Bedienungsanleitung - Sammler-Uhren

Wichmann Brothers Berlin Arithmometer Instruction Manual

 

Original and complete operating instructions for the legendary Gebrüder Wichmann calculating clock

This "calculating clock" based on the design of the Gebrüder Wichmann has five scales on the front and six on the back. On the front, there are two normal scales that can be rotated against each other, a two-part square scale, and finally, a linear scale for direct reading of logarithms.

The back also has two normal scales that can be rotated against each other, one of which is inverse (reciprocal scale). A three-part cubic scale and a sine scale complete the design.

Participants Invention: Gebr. Wichmann
Locations Invention: Berlin
Dating Manufacture: approx. 1920
Material Metal
CN - Cellulose nitrate
Silver alloy
Dimensions Mass: 0.12 kg
Object dimensions (H x W x L/D): 11 x 90 x 68 mm
Object dimensions (H x W x L/D): 8 x 75 x 80 mm
Literature
  • Anthes, Erhard; Prinz, Ina: Historische Rechenmaschinen. Arithmeum, Rheinische Friedrich-Wilhelms-Universität Bonn. Bonn 2010 (Patrimonia, Vol. 353). S. 313, Fig. 313 (BVB)
  • Bauer, Friedrich L. (Ed.): Informatik. Führer durch die Ausstellung (Exhibition Catalog Deutsches Museum). With the collaboration of Erhard Anthes, Joachim Fischer, Menso Folkerts, Ulf Hashagen, Alfred Krösa, Hartmut Petzold, Ivo Schneider and Heinz Zemanek. New edition Munich 2004. S. 46
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