FRSE (28 December 1827 – 27 July 1905) was a Swedish physicist.

He was an expert on terrestrial magnetism and spectrum analysis.

After some travelling scholarships to observatories in England, France and Germany, he was promoted to Assistant Professor in 1861.

During this period, he received much criticism for favouring Angstrom's son, Knut, as a star pupil.

[5] In 1886, he was elected an Honorary Fellow of the Royal Society of Edinburgh.