Galileo Galilei,Italian scientist and a pendulum

Numéro d’image : 11828785
Galileo Galilei,Italian scientist and a pendulum
Galileo Galilei. Engraving of Galileo Galilei (1564-1642),Italian scientist,first noticing how a pendulum swings. While Galileo was a medical student in Pisa in 1582 he observed a lamp which was swinging in the city's cathedral,and so acting as a simple pendulum. He noticed that the lamp took the same time to do one swing,regard- less of how far it had to swing. This observation led him to perform experiments which showed that the period of a pendulum's swing depends on its length. He used pendulums to monitor a person's pulse rate and to regulate a clock. "Galileo's lamp" which hangs in the cathedral was not installed until 1587 (and is now electric)
Licence : Droits gérés
Crédit: Science Photo Library
Taille de l’image : 2516 px × 3770 px
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