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Darwin Correspondence Project

Alexander Ross Clarke


Geodesist. Graduated from the Royal Military Academy, Woolwich, and was commissioned as a second lieutenant in the Royal Engineers, 1847. Posted to the Ordnance Survey in Southampton, 1850; chief mathematical and scientific adviser, and head of the trigonometrical and levelling departments, from 1856. In 1860, began a comparison of different national standards of length. Retired in 1881. FRS 1862.


Nature, 19 February 1914, pp. 692–3



ODNB: Oxford dictionary of national biography: from the earliest times to the year 2000. (Revised edition.) Edited by H. C. G. Matthew and Brian Harrison. 60 vols. and index. Oxford: Oxford University Press. 2004.