Keywords: Vertikaaliympyrä 3.JPG en Wetzer vertical circle from ca 1850 in Helsinki observatory fi Wetzerin vertikaaliympyrä noin vuodelta 1850 Helsingin observatoriossa own MKFI 2012-12-01 Collections of the Helsinki Observatory Historical astronomical instruments 2012 in Helsinki December 2012 in Finland Taken with Canon EOS 60D Taken with Canon EF-S 15-85mm F3 5-5 6 IS USM Files by User MKFI |