Galileo was younger, was a Catholic day of Pisa Cathedral, Galileo to go to church. Magnificent church, the believers kneeling over one place, they listened while the priest piously explain the Bible, from the moment for prayer and sang hymns. Nineteen-year-old Galileo was beginning to feel bored, in order to pass these annoying time up he looked around involuntarily. Suddenly, a mid-air suspension of copper chandelier in the church caught his attention. Looked for a long time, I saw chandelier is the wind coming in the doorway, swinging back and forth. He slowly found such a rule: No matter the size of chandeliers swing amplitude, the time is equal.
Openings and blowing in the wind, blown chandelier swinging dramatically. Galileo’s finger touched the left wrist with his right hand on the pulse of the check up: one, two, three .. a total of twenty-under. Chandeliers swing amplitude becomes smaller, but his pulse to check with their number, each swing is still under twenty.
“The original chandeliers isochronous swing characteristics are ah.” He thought.
Galileo returned home, and that swinging the old copper chandeliers around together in his mind.
He me a rope, hanging it on a heavy swing, found such a phenomenon: the time 传奇sf spent swinging time, hanging with the weight of the object does not matter, but a relationship with the pendulum length. After repeated experiments he finally invented the isochronous pendulum law.
Later, the Dutch scientist Li Si Qinhai He also Sri Lanka under the law, create a variety of mechanical pendulum clock accurate time.