File:Vaisala diary.JPG

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English: A laboratory diary of Finnish astronomy professor Yrjö Väisälä. The text is written in 1929. On the pages seen here Väisälä describes the principle of 'a new telescope for photography'. Väisälä never published this concept and few years later Estonian Bernhard Schmidt invented the same construction which is nowdays known as Schmidt camera.
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Author Xepheid

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29 June 2009

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current14:24, 7 July 2009Thumbnail for version as of 14:24, 7 July 20092,000 × 1,301 (613 KB)Xepheid{{Information |Description={{en|1=A laboratory diary of Finnish astronomy professor Yrjö Väisälä. The text is written at 1929. On the pages seen here Väisälä describes principle of 'a new telescope for photography'. Väisälä never published this
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