[55] Carolyn Eisele, “Charles S. Peirce—Nineteenth-Century Man of Science,” Scripta Mathematica (1959), vol 24, p. 305. For the account of the work of Peirce, the authors are greatly indebted to this pioneer paper on Peirce’s work on gravity. It is worth noting that the history of pendulum work in North America goes back to the celebrated Mason and Dixon, who made observations of “the going rate of a clock” at “the forks of the river Brandiwine in Pennsylvania,” in 1766-67. These observations were published in Phil. Trans. (1768), vol. 58, pp. 329-335.
[56] The pendulums with conical bobs are described and illustrated in E. D. Preston, “Determinations of Gravity and the Magnetic Elements in Connection with the United States Scientific Expedition to the West Coast of Africa, 1889-90,” Report of the Superintendent of the Coast and Geodetic Survey for 1889-90 (Washington, 1891), app. no. 12.
[57] Eisele, op. cit. (footnote [55]), p. 311.
[58] The record of Peirce’s observations in Europe during 1875-76 is given in C. S. Peirce, “Measurements of Gravity at Initial Stations in America and Europe,” Report of the Superintendent of the Coast Survey for 1875-76 (Washington, 1879), pp. 202-337 and 410-416. Peirce’s report is dated December 13, 1878, by which time the name of the Survey had been changed to U.S. Coast and Geodetic Survey.
[59] Verhandlungen der vom 20 bis 29 September 1875 in Paris Vereinigten Permanenten Commission der Europäischen Gradmessung (Berlin, 1876).
[60] Ibid. See report for fifth session, September 25, 1875.
[61] The experiments at the Stevens Institute, Hoboken, were reported by Peirce to the Permanent Commission which met in Hamburg, September 4-8, 1878, and his report was published in the general Bericht for 1878 in the Verhandlungen der vom 4 bis 8 September 1878 in Hamburg Vereinigten Permanenten Commission der Europäischen Gradmessung (Berlin, 1879), pp. 116-120. Assistant J. E. Hilgard attended for the U.S. Coast and Geodetic Survey. The experiments are described in detail in C. S. Peirce, “On the Flexure of Pendulum Supports,” Report of the Superintendent of the U.S. Coast and Geodetic Survey for 1880-81 (Washington, 1883), app. no. 14, pp. 359-441.
[62] Verhandlungen der vom 5 bis 10 Oktober 1876 in Brussels Vereinigten Permanenten Commission der Europäischen Gradmessung (Berlin, 1877). See report of third session, October 7, 1876.
[63] Verhandlungen der vom 27 September bis 2 Oktober 1877 zu Stuttgart abgehaltenen fünften allgemeinen Conferenz der Europäischen Gradmessung (Berlin, 1878).
[64] Verhandlung der vom 16 bis 20 September 1879 in Genf Vereinigten Permanenten Commission der Europäischen Gradmessung (Berlin, 1880).