File:Observatório Astronômico da Universidade Federal do Rio Grande do Sul 04.JPG

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Português: Observatório Astronômico da Universidade Federal do Rio Grande do Sul : Relógio de Pendulo Opperman

Fabricante: Adolf Opperman. Berlim, Alemanha

English: Two antique precision regulator clocks at the Astronomical Observatory of the University of Rio Grande do Sul. The center clock, manufactured by Adolf Opperman. Berlin, Germany, has a mercury pendulum which compensates for temperature induced changes in the length of the pendulum rod. Astronomical regulator clocks minimized error due to gear friction by having the simplest possible gear train. To simplify it, rather than have the hands mounted on concentric shafts they are mounted on the shafts of separate gearwheels, so the face has three separate dials for seconds, minutes and hours. The largest dial is for the second hand.
Data: 1912
Date
Source Own work
Author Eugenio Hansen, OFS

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current06:29, 27 September 2012Thumbnail for version as of 06:29, 27 September 20123,216 × 4,288 (3.58 MB)Eugenio Hansen, OFS (talk | contribs)User created page with UploadWizard

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