In the latter year he was sent to South Africa to participate in the Second Boer War, serving as head of topography of the Field Intelligence Department.
[3] In addition to various reports on his work in 1906 he published a paper on "The Employment of Survey Sections in War" in the Royal Engineers Journal.
[4][5] He started publication of the Transvaal degree sheets, on a scale of 1 [English] inch = 1000 Cape roods (1:148 752), the last of which appeared in 1909.
[1][6] In 1905 Jackson returned to the Ordnance Survey in England for a further three years before he was appointed as the first Surveyor-General of the Federated Malay States.
[1] Jackson married Margaret Edith Maitland Courtney (1870–1943) on 5 December 1893 at St Jude's Church, Egham.