Abstract
This volume on the Aurora Borealis forms part of the scientific work done in connection with the measurement of a meridian arc on Spitzbergen Island by the Swedish and Russian Governments in 1899 to 1902. The locality of observations was at the Bay of Treurenberg in latitude 79°55′.1 N., and longitude 16°51′.5 east of Greenwich. The observations were to follow the methods of those of the Swedish expedition of 1882–3. Daily observations were obligatory at certain stated hours, and on every fifth day every quarter hour between 8 and 10 P.M. Greenwich mean time.
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