File:John Bird quadrant.JPG

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English: John Bird quadrant (before 1775), from the end of 18th century in Helsinki observatory.
Suomi: John Birdin kvadrantti 1700-luvun lopulta Helsingin observatoriossa.
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Author MKFI
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Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
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I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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current21:19, 12 January 2013Thumbnail for version as of 21:19, 12 January 20132,490 × 3,456 (3.06 MB)MKFI (talk | contribs){{Information |Description ={{en|1=John Bird quadrant from the end of 18th century in Helsinki observatory.}} {{fi|1=John Birdin kvadrantti 1700-luvun lopulta Helsingin observatoriossa.}} |Source ={{own}} |Author =MKFI ...

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