The pendulum clock usually has its pendulum suspended by a thin flat spring, and to avoid breaking this spring when the clock is to be moved from one place to another, it is best either to unhook the bob from the pendulum rod or to secure the pendulum tightly to the clock works or case so that it cannot swing. In setting up such a clock after removal, it is necessary to put the clock "in beat"; that is, to make the successive vibrations of the pendulum, or the time between successive ticks of the clock, of equal length. This must be done by carefully leveling the clock on its support, unless the clock is provided with adjusting thumbscrews at the top of the pendulum by the movement of which one way or the other it can be made to beat uniformly.