Galileo Galilei to the biography by Vincenzo Viviani) that these began by watching the swings of the bronze chandelier in the cathedral of Pisa, using his pulse as a timer. Later experiments are described in his "Two New Sciences". Galileo claimed that a simple pendulum is isochronous, i.e. that its swings always take the same amount of time, independently of the amplitude. In fact, this is only approximately true, as was discovered by Christiaan Huygens. Galileo also found that the square of the period varies directly with the length of the pendulum. Galileo's son, Vincenzo, sketched a clock based on his father's
Galileo Galilei (opera) book, the fictitious characters come alive to discuss the theories presented. "Here, the Older Galileo becomes the Younger Galileo." "Incline Plane" The theories and experiments are put to the test in Galileo's laboratory. "A Walk in the Garden" Galileo and his great friend Cardinal Barberini discuss Galileo's newest book in the Garden. After the Cardinal's feeble attempt at poetry, Galileo expresses his fear of his enemies. Barberini warns Galileo not to continue with his theories regarding the planets. "Lamps" While at mass with his daughter, Galileo observes the swinging of a lamp suspended from the ceiling moving in pendulum fashion