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    hiking on the VPP trail, zavizan, velebit, croatia

    1. winer2008 49 months ago | reply

      What is this instrument?

    2. ejovrh 49 months ago | reply

      Gordon Foy
      that instrument is a sunshine recorder.
      it measures the duration of sunshine by burning a strip of paper behind the lens when the sun shines.
      see the wikipedia entry for it:

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