HJULER, A. (+) (O. OLUFSEN).

The Second Danish Pamir Expedition - Measurements of the electric tension of the air.

(Copenhagen), Det Nordiske Forlag, 1903.

Large8vo. In the original printed wrappers. With author's presentation inscription to top of front wrapper. White label and blue library strip to front and back wrapper. Barcode to back wrapper. Internally fine and clean. 25 pp.

Presentation-copy of Hjuler's meteorological observations on the electric tension of the air made on the second Danish Pamir expedition. The present copy was given by Olufsen to Adam Paulsen who organized early Arctic aurora expeditions funded by the Carlsberg Foundation including a 1899 - 1900 mission to Haldde, Finland (Lapland) led by Dan la Cour. The expedition successfully measured the height and magnetic spectrum of the aurora borealis while artist Harald Moltke famously documented its colors through paintings. Paulsen became one of the first scientists to correctly theorize that the aurora is caused by electron radiation.

Order-nr.: 63694