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 addition to and already being operated by the Falangists) to the Spanish Legion (Legión Española or Tercio de Extranjeros). "Galileo Galilei" was one of the four boats chosen for the transfer. On 26 September 1937 "Galileo Galilei" arrived at Soller on Mallorca. She was placed under the direct command of Spanish admiral Francisco Moreno, was renamed "General Mola II" and assigned pennant number L1. However, "Galileo Galilei" retained her commander (captain Mario Ricci), senior officers and Italian crew, but they had to wear Spanish uniforms and insignia. The other three Italian submarines transferred to Tercio were ("Aguilar Tablada"), ("Gonzalez Lopez")