Die Sonnenfinsternis-Expedition 1952 der Schweizerischen Naturforschenden Gesellschaft

The Swiss solar eclipse expedition to the Sudan consisting of 8 members had erected its camp on the north river of the Blue Nile near Khartoum. The main instruments were a horizontal camera of 8 m focal length, a similar one of 2 m, a double camera on an equatorial mounting to study the polarisation of the coronal light and four spectrographs for the… (More)