A device for stepping up or stepping down the voltage of an alternating current by means of magnetic induction.
A variable inductance for changing the period of the receptor circuit.
The unit of electrical force or potential. The electromotive force which, if steadily applied to a conductor whose resistance is one ohm, will produce a current of one ampere.
An instrument for measuring voltage.
Unit of work. It is the rate of work of one ampere flowing under a potential of one volt. Seven hundred and forty-six watts represent one electrical horsepower.
Plate VI. DeForest and Marconi Systems.
CHAPTER XVIII. THE AMATEUR AND THE WIRELESS LAW. WHAT IT IS; HOW TO COMPLY; HOW TO SECURE A LICENSE.
On August 13, 1912, Congress enacted a "Wireless Law" to regulate radio communication. The whole law may be found in the appendix of this book, but briefly as far as the amateur is concerned it is as follows:
An amateur may not use transmitting apparatus which is sufficiently powerful to send radio signals across any of the boundaries of the state in which he is located and which can be detected by a sensitive receiving set located just beyond the state boundary, nor can he use apparatus which is powerful enough to interfere with the reception of signals by others from beyond the state boundaries unless he has a license.