Note 8 — DEVELOPMENT OF GRAVITY PENDULUMS IN THE 19th CENTURY
Reading edition
Jean Richer, Observations astronomiques et physiques faites en l’isle de Caïenne (Paris, 1679). John W. Olmsted, “The Expedition of Jean Richer to Cayenne 1672-1673,” Isis (1942), vol. 34, pp. 117-128.