< Page:EB1911 - Volume 02.djvu
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Plate I.
AURORA

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| |- |align="center"|Fig. 1—TWO TYPES OF AURORAL ARCS. |}


Fig. 2—TWO TYPES OF AURORAL RAYS.

(From the Internationale Polarforschung, 1882-1883, by permission of the Kaiserlichen Akademie der Wissenschaften, Vienna.)



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