Resources
Journal papers
Dolfo, G. and J. Vigue (2015), "A more accurate theory of a flexible-beam pendulum," Am. J. Phys. 83 (6), 525 - 30.
Hoyng, P. (2014), "Dynamics and performance of clock pendulums," Am. J. Phys. 82, 1053 - 61.
Books
Aczel, A. D. (2003), Pendulum: Leon Foucault and the Triumph of Science (Atria Books).
Matthys, R. J. (2004), Accurate Clock Pendulums (Oxford Univ. Press).