The enormous use of both step-up and step-down transformerstransformers which respectively induce currents of higher and of lower electromotive forces in their secondary coils than are passed through their primariesshows the great practical value of this invention.

It is an interesting fact that it was not in the form of the step-down alternating-current transformer that Faraday's discovery of voltaic-current induction was first utilized, but in the form of a step-up transformer, or what was then ordinarily called an induction coil.

The high pressures required for the economical use of transmission lines necessitates the employment of transformers at each end of the line; namely, step-up transformers at the transmitting end, to raise the voltage delivered by the generators, and step-down transformers, at the receiving end, to lower it for use in the various translating devices.

These generators will be wound to produce an electric pressure of 12,000 volts, raised by means of step-up transformers to 22,000, 40,000, and 60,000 volts, according to the distance of transmission.

A fourteen-year-old stripling sprang down to help her but she managed the step-up without his hand.

The changes brought about in the human life pattern in the course of the great revolution have created a new worldin structure, in function, in outlook, in stepped-up capacity for even more spectacular changes in the future.