Surveyor

Sources

Historical records of the Survey of India (Dehra Dun, 1945-48) by Reginald Henry Phillimore. Comprises 5 volumes. Available on open shelves at British Library shelfmark OIR.354.54. Includes biographical notes of persons involved in the geographical and historical survey of India (the Great Trigonometrical Survey of India) from 1777 to 1843.

"The Trigonometrical Survey" by FC Danvers (a transcript of an article, possibly that in Quarterly Journal of Science VII 1870 pages 448-458)
"The Great Trigonometrical Survey of India in a Historical Perspective" by Rana Deb Roy Indian Journal of History of Science 21(1):22-32 (1986)

A manual of surveying for India, detailing the mode of operations on the revenue surveys in Bengal and the North-western provinces by Ralph Smyth and Henry Edward Landor Thuillier 1851 Archive.org
A Memoir On The Indian Surveys by Clements R Markham Archive.org First Edition 1871, 2nd Edition 1878
"Great Indian Trigonometrical Survey" from Ways and works in India being an account of the public works in that country from the earliest times up to the present day by G. W. Macgeorge 1894 Archive.org