Kissing the cheeks of Huygens

Abstract How well do the so-called cheeks of Huygens enforce a constant time oscillation on pendulum, independent amplitude pendulum swing? We use video measurement tool to test it with homemade experimental setup that can be fruitfully used in classroom and physics laboratory settings. Data fits reveal how confirms usefulness Huygens. Comparisons computer model results recorded data have been made for same purpose. The equation motion string arbitrary length winds along two surfaces cycloidal is derived, too. Numerical solutions this are error analysis measurements setup.