. "pendulum's period" . "Pendulum#Compound pendulum" . . "pendulums" . . "pendulum swinging weight" . "Pendulum#Torture device" . "Pendulum" . "clock pendulums" . "damped pendulum" . . "Pendulum" . "law of the pendulum" . "compound pendulum" . . "Pendulum#Mercury pendulum" . . . . . . "circular error" . "measure the strength of Earth's gravity" . "pendulum" . "mercury pendulum" . . . "Pendulum#1656:_The_pendulum_clock" . "Isochronism of the pendulum" . . "gravity pendulum" . . "simple pendulum" . "pendulous" . . "Pendulum instrument" . "isochronous" . "pendula" . . "pendant" . "Pendulum#Coupled pendulums" . "undamped pendulum" . . . . . .