1. Quoted in W. E. May, A History of Marine Navigation (Henley-on-Thames: Foulis, 1973), p. 29.
2. M. Hotine, ‘The Re-triangulation of Great Britain: IV — Base Measurement’, Empire Survey Review, 34 (1939), 211–25 (p. 217).
3. Charles-Édouard Guillaume, La convention du mètre et le Bureau international des poids et mesures (Paris: Gauthier-Villars, 1902), p. 21.
4. Ken Alder, The Measure of All Things (London: Little, Brown, 2002)
5. Michael Kershaw, ‘The “Nec Plus Ultra” of Precision Measurement: Geodesy and the Forgotten Purpose of the Metre Convention’, Studies in the History and Philosophy of Science, 43 (2012), 563–76, on the geodetic role of the metre.