The skeleton clocks differ from others because their movement isn´t covered with the clock housing. The beholder has a chance to watch the operation of the clock movement. The first skeleton clock was made approximately in the middle of the eighteenth century. Since this time the clockmakers try to show how well they can made a perfect and sometimes also very complicated clock mechanism. As well these skeleton clocks represent some other solution of the simple assignment: to swing the pendulum and at the same time count its swings and so measure the irrecoverably elapsing time. The keynote is the simplicity of the easy finding out of the time. The clocks have only one hand and it is enough to see how the time flies.