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Lessons in Wireless Telegraphy

Chapter 3: INTRODUCTION
By Alfred Powell Morgan
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About This Book

This work presents a compact, lesson-based introduction to the physical principles behind wireless telegraphy, aiming to give operators a clear theoretical grounding. Arranged in discrete lessons, it starts with magnetism, magnetic induction, and basic electrochemical cells, then develops circuit laws and the components and methods for producing, radiating, and detecting electromagnetic signals. Emphasis is on clear explanations, illustrative diagrams, and simple experiments to show how transmitters, receivers, antennas, and tuning interact, while detailed engineering and maintenance procedures are deferred to a companion volume.

LESSONS IN WIRELESS TELEGRAPHY

INTRODUCTION

This little book has been brought forward in order to supply the demand for a systematic elementary course in the principles of wireless telegraph apparatus and the electrical laws upon which it depends.

Many operators, both amateur and professional, although perfectly well able to send and receive messages, do not thoroughly understand the rudimentary theory of the instruments.

It is readily realizable that it is quite impossible to enter into all the engineering details in a book of this size, but at the same time it has been possible to present a very comprehensive treatise of the subject and embody sufficient material to give a thorough grounding in the subject.

In order to avoid repetition and confusion and to make each instrument or principle which has been discussed stand distinctly by itself, the text has been divided into separate lessons following in their arrangement, as far as has been possible, the logical sequence.

For the same reason, and also because of lack of space all details pertaining to the actual maintenance and adjustment of the instruments has been embodied in another book called "The Operation of Wireless Telegraph Apparatus."