Unpublished letter, regarding terrestrial magnetism from Professor Langberg to Edward Sabine Langberg thanks Sabine for sending him publications on magnetism and meteorology. He writes regarding the discovery of 'the direct action of the sun on the magnetism of the Earth' and existing research into this topic. Annotations in pencil throughout. Subject: Magnetism Written by Langberg in Christiania [Oslo, Norway]. Whilst the Royal Society declined to publish this paper in full, an abstract of the paper was published in volume 7 of the Proceedings of the Royal Society as 'Extract of a letter from Professor Langberg of Christiania to Colonel Sabine, dated June 10th, 1855. Communicated by Colonel Sabine, V. P. and Treas. R. S'. 10 January 1855