Chronometers and aneroid barometers in helsinki observatory. 2: aneroid barometer, mid-19th century; 3: aneroid barometer, greiner-geissler, before 1875; 4: chronometer, john n. Arnold, 1807; 5: chronometer, c. F. Tiede ca. 1836; 6: choronometer, nieberg, 1850-1950.
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