The Potential Function of Benzene [together with 5 other short monographs ca. 1945-1948]

23x15cm, SIX VOLUMES. This is a collection of 6 short monographs, all authored by Bak, each separately bound in original wrappers. All are of the series "Det Kgl. Danske Videnskabernes Selskab, Matematisk-fysiske Meddelelser". Includes: 1) "The Potential Function of Benzene" [1945; 31pp]; 2) "The Potential Function of Methane" [1946, 33pp]; 3) "The Potential Functyion of Ethane" [1946; 27pp]; 4) "Geometry of the Molecules Methyl, Chloride and Methyl Bromide" [1947, 7pp]; 5) "Hindered Rotation IV: The Raman Spectrum of Deuterated Ethyly Bromides" [co-authored with A. Langseth; 1947; 16pp]; 6) "Spectroscopy and Thermodynamics" [1948; 35pp]. ["Bak ..was a Danish polymath, inventor, chemist and Professor of Molecular Spectroscopy at the University of Copenhagen, best known for his early contributions to the field of Molecular Spectroscopy..Shortly after the Second World War, Bak traveled to Berkeley, California (194647) where he in collaboration with W. D. Gwinn built the first microwave spectrograph, an instrument that could be realized thanks to components developed originally for use in advanced war-time radar systems (Klystron oscillator).[6] This work involved a considerable amount of vacuum-tube electronics and the handling of microwave radiation. At first they tried to detect the absorption in long lengths of waveguide, but shortly thereafter Stark modulation was developed and special waveguides containing an electrode allowed for the transmission of microwaves., " - wikipedia].…