File:Argelanderin refraktori 1.JPG

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English: Argelander's refractor from ca. 1820-1835 preserverd in Helsinki observatory western rotunda. The two astronomical pendulum clocks are from 1760s-1780s (left) and ca. 1823 (right).
Suomi: Argelanderin refraktori, valmistettu noin 1820-1835, museoituna Helsingin observatorion länsirotundassa. Kaksi astronomista heilurikelloa ovat 1760-1780-luvulta (vasen) ja noin vuodelta 1823 (oikea).
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current20:07, 4 January 2013Thumbnail for version as of 20:07, 4 January 20135,184 × 3,456 (5.83 MB)MKFI (talk | contribs){{Information |Description ={{en|1=Argelander's refractor from ca. 1820-1835 preserverd in Helsinki observatory western rotunda.}} {{fi|1=Argelanderin refraktori, valmistettu noin 1820-1835, museoituna Helsingin observatorion länsirotundassa.}} |So...

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