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 were transferred to Massawa in Eritrea where she formed 81st Squadron of VIII Submarine Group. At the time of Italy's entrance into World War II "Galileo Galilei" was stationed at the Italian base of Massawa on the Red Sea being part of the Italian Red Sea Flotilla. On June 10, 1940 the submarine under command of captain Corrado Nardi was ordered to proceed to her area of operation near Aden where she arrived on June 12. In the early morning of June 16, while submerged, she intercepted Norwegian tanker , about 12 miles south of Aden. After surfacing and ordering