File:Observatório Astronômico da Universidade Federal do Rio Grande do Sul 04 clock closeup.jpg
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Original file (1,359 × 4,053 pixels, file size: 3.01 MB, MIME type: image/jpeg)
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Summary
| Description |
English: An antique precision regulator clock at the Astronomical Observatory of the University of Rio Grande do Sul, Porto Alegre, Brazil. Manufactured by Adolf Opperman, Berlin, in the late 19th century, the clock 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. |
| Date | |
| Source | Observatório Astronômico da Universidade Federal do Rio Grande do Sul 04.JPG. Cropped out other clock |
| Author |
Original version: Eugenio Hansen, OFS This version: Chetvorno |
| Other versions | Observatório Astronômico da Universidade Federal do Rio Grande do Sul 04.JPG |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 08:52, 4 July 2024 | | 1,359 × 4,053 (3.01 MB) | Chetvorno | Uploaded a work by Eugenio Hansen, OFS from File:Observatório Astronômico da Universidade Federal do Rio Grande do Sul 04.JPG with UploadWizard |
File usage
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