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Proportionalcirkel fr aritmetiska och trigonometriska berkningar Johan Gustaf Hasselstrm Livrustkammaren negative.tif Instrument sammanstatt av tunna mssingsplattor ihopfllbart med en cirkelrund axel mm sidorna hl fr en konturerad styrskena fst ena halvan br dekor axeln en stiliserad ros Mttskalor ena sidan utefter ytterkanten