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一天,比萨大学的一群医科学生正跪在大教堂里祈祷。大厅一片寂静,只有一盏教堂顶悬挂下来的油灯,在空中来回摆动,挂灯链条发出的嘀嗒声惊扰了学生们的祈祷。在摆动着的油灯节奏中,一位年轻的学生仿佛突然来了灵感,他觉得链条的节奏是有规律的,那盏嘎嘎作响的挂灯,尽管往返的距离越来越短,但是挂灯往返摆动一次的时间却似乎一样长!回家后,他找来两根同样长的绳索,各坠上一块相同质量的铅块,然后分别系在不同的横梁上,开始做实验。通过实验,他发现两条绳索的起点虽不相同,但摆动的次数是相同的,即在同样的时间内到达同样的点上。就这样,这位年轻人发现了摆振动的等时性原理。今天,这项原理已广泛应用于时钟计时、脉搏计数等方面。这位年轻的医科学生就是伽利略。
One day, a group of medical students at the University of Pisa were praying in the cathedral. The hall was silent. Only the oil lamp hanging from the top of the church oscillated back and forth in the air. The buzzing sound from the hanging lamp chain disturbed the prayers of the students. In the rhythm of the oscillating lamp, a young student seemed to be suddenly inspired. He felt that the rhythm of the chain was regular. The buzzing hanging lights, despite the shorter and shorter distance, were hanging lights. The time it took to swing back and forth seemed to be just as long! After returning home, he found two equally long ropes, each with a lead mass of the same quality, and then tied them to different beams to begin experimentation. Through experiments, he found that although the starting points of the two ropes are not the same, the number of swings is the same, that is, they reach the same point in the same time. In this way, the young man discovered the isochronic principle of oscillation. Today, this principle has been widely used in clock timing, pulse counting and so on. The young medical student is Galileo.