你也可以自己用绳子和任何的重物制作一个钟摆。假如愿意的话，你还能用它来做试验。也许你就会算出每两秒钟摆动一次的钟摆的摆长应该是多少。
galileo and the lamps
in italy about three hundred years ago there lived a young man and al the reasons for things. he invented the thermometer and simple forms of the telescope and the microscope. he made many important discoveries in science.
one evening hteen years old he hted. the lamps— by long rods from the ceiling. hter knocked against them, or the h the cathedral, they back and forth like pendulums. galileo noticed this. then he began to study them more closely.
he sa on rods of the same length s back and forth, or vibrated, in the same length of time. those that er rods. as galileo ing to and fro he became much interested. millions of people had seen lamps moving in this same ht of discovering any useful fact connected an to experiment. he took a number of cords of different lengths and hung them from the ceiling. to the free end of each cord he fastened a ht. then he set all to sing back and forth, like the lamps in the cathedral. each cord study that , it vibrated just sixty times in a minute. a cord one fourth as long vibrated just tth. by experimenting in various ing lamps in the cathedral, and to galileo’s habit of thinking and inquiring, the ht of any kind. you can experiment a pendulum must be to vibrate once in two seconds.
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