Frequency relations of parametric interactions

The parametric concept can be used to join conventional language to the language of quantum mechanics. In this article the philosophy of the parametric viewpoint is developed in terms of ordinary mechanics and the relevance of machines to energy levels is given in simple terms. Energy-level diagrams are employed to investigate various devices, which bear strong underlying relationships but have no superficial resemblance to each other. By the use of an energy-level characterization a new form of servomechanism is devised.