Waves And Ripples in Water Air And Aether Being a Course of Christmas Lectur
Waves And Ripples in Water Air And Aether Being a Course of Christmas Lectur
John Ambrose Fleming
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Here, for instance, is a heavy ball suspended by a spiral spring (see Fig. 53). If I pull the ball down a little, and then let it go, it jumps up and down, and executes vertical vibrations. The elastic control here is the spring which resists extension. In this instance, also, there is a natural free time of vibration, independent of the extent of the motion, but dependent upon the weight of the ball and the stiffness of the spring. A good illustration of the above principles may be found in th...e construction of a clock or a watch. A clock contains a pendulum which vibrates in a certain fixed time. The arrange- ments we call the " works " of a clock are only a contrivance for counting the swings, and re- cording them by the "hands" of the clock. Owing, however, to the friction of the " works, " FIG 53 the pendulum would soon come to rest, and hence we have a mainspring or " weights " which apply a little push to the pendulum at each swing, and keep it going. In a watch there is no pendulum, but there is a "balance-wheel and hair-spring, " or a wheel which has a spiral spring attached to it, so that it can swing backwards and forwards through a small angle.
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