S2A3 Biographical Database of Southern African Science

Van der Lingen, Prof Jan Stephanus (applied mathematics)

Born: 12 December 1887, Kroonstad, Free State, South Africa.
Died: 29 June 1950, Pretoria, South Africa.

Jan Stephanus van der Lingen, son of Reverend Gottlieb Wilhelm Brueckner van der Lingen and his wife Susanna Sophia, born Moll, attended school in Kroonstad, where his education was interrupted when his family were sent to East London during the Anglo-Boer War (1899-1902). Upon his return to Kroonstad he continued his education, but left school to join an engineering firm as an apprentice electrician. By the time he qualified he had developed an interest in the natural sciences and enrolled for a correspondence course offered by the Franklin Institute in the United States. As a result he was invited to continue his studies in the United States. However, his father would not let him go before he had passed the matriculation examination of the University of the Cape of Good Hope. This he achieved through the High School in Kroonstad in 1907, after which he decided to continue his studies in applied mathematics and physics at Victoria College (later the University of Stellenbosch). He was awarded the degree Bachelor of Arts (BA) with honours in applied mathematics by the University of the Cape of Good Hope in 1911.

After teaching for some time at Cradock, Eastern Cape, he acted as a temporary assistant in the Department of Applied Mathematics at the South African College (from 1918 the University of Cape Town) during the fourth term of 1912. He then received a bursary which enabled him to proceed to Zurich to study agricultural engineering. There he came under the influence of the Nobel Prize winner Max von Laue, who encouraged him to conduct research in X-ray crystallography. As a result of over-exposure to X-rays he had to return to South Africa to recuperate and was prevented from continuing his studies in Zurich by the outbreak of World War I (1914-1918). In the beginning of 1915 he therefore accepted an appointment as lecturer in applied mathematics at the South African College, under Professor Alexander Brown*. There he remained until 1920, when he was awarded a bursary by the Johns Hopkins University in Baltimore, United States, where he obtained a doctoral degree in 1921 with a thesis entitled The fluorescence of mercury vapour. His thesis was published in the Astrophysical Journal that same year. Meanwhile he had started research in biophysics and briefly became the head of a newly created sub-department of biophysics in the medical school of Johns Hopkins University. He retained an interest in biophysics, especially in radiology, for the rest of his life.

Van der Lingen remained at the University of Cape Town until 1930, when he was appointed head of the Department of Physics at the University of Pretoria. That same year the government asked him to become the chairman of the newly created Fuel Research Board, a position he held until at least 1939.

Van der Lingen had an outstanding ability to design his own experimental equipment and several of his designs came into general use in physics laboratories. His interest was mainly focussed on the general principles underlying physical phenomena, leaving the investigation of the details to others. He had a thorough knowledge of the mathematical aspects of his subject, which he taught with enthusiasm; also a restless mind and a high opinion of himself. His fifty or so scientific publications covered a wide range of topics. Among others the following papers by him appeared in the Transactions of the Royal Society of South Africa: 'On the space lattice of liquid crystals' (1915), 'On the lines within roentgen interference photograms' (1916), 'Heating and cooling apparatus for roentgen crystallographic work' (1916), 'Note on the ionisation produced by degenerating nerve-muscle preparations' (1917), and 'On hyalite' (a transparent variety of opal; with A.R.E. Walker*, 1922). He was elected a Fellow of the Royal Society of South Africa in 1922 and served on its council from 1923 for some time. Many later papers by him were published in the South African Journal of Science, including 'On the planetesimal hypothesis' (1924), 'On the supposed photo-activity of cod liver oil' (1926), 'A universal gas-pressure apparatus for comparative spectroscopy' (1936), 'Absorption spectra of olive oil in the near infra-red' (1936), and 'A modification of the Jaeger surface tension apparatus' (1936). He became a member of the South African Association for the Advancement of Science in 1912 and was president of Section A in 1928. He was also a Fellow of the Institute of Physics and became a member of the South African Chemical Institute in 1931.

Van der Lingen was married to Enid Christine Wilcocks, with whom he had two sons and a daughter.

List of sources:

Bleksley, A.E.H. Prof Dr J.S. van der Lingen (1887-1950). Tydskrif vir Wetenskap en Kuns, 1951, Nuwe Reeks, Deel 11(2), pp. 18-20.

Geni. http://www.geni.com/people/Jan-van-der-Lingen/6000000021552051340

National Archives Repository (TAB). Source MHG, Vol. 0, Ref. 3548/50, death notice, Jan Stephanus van der Lingen.

National Automated Archival Information Retrieval System (NAAIRS). http://www.national.archives.gov.za/naairs.htm Documents relating to Jan Stephanus van der Lingen / J.S. van der Lingen.

National Union Catalogue, pre-1956 imprints. London: Mansell, 1968-1980.

Phillips, H. The University of Cape Town, 1918-1948: The formative years. Cape Town: UCT, 1993.

Ritchie, W. The history of the South African College, 1829-1918. Cape Town: T. Maskew Miller, 1918.

South African Chemical Institute. Proceedings and list of members, 1933-1934.

South African Journal of Science, 1914-1936, Vol. 11-33: Papers by van der Lingen; list of members.

Transactions of the Royal Society of South Africa, 1915-1925, Vol.5-12: Papers by van der Lingen; minutes of proceedings.

University of the Cape of Good Hope. Calendar, 1908/9, 1912/3, 1917/8.

Compiled by: C. Plug