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
Italian submarine Galileo Galilei the crew to leave the ship, "Galileo Galilei" fired three torpedoes that set the ship on fire and sank the tanker. It is likely, the explosions were heard in Aden and the smoke column rising from the burning tanker was also observed, but no British ships or planes appeared and the submarine continued her mission unmolested until the afternoon of June 18 when a Yugoslavian steamer was spotted. "Galileo Galilei" fired a shot across the bow ordering the ship to stop, but after seeing the ship was under a neutral flag, the steamer was allowed to leave. However, the gunfire