FOREWORD
Because Radio is the result of the development of the
science of electricity, the fundamental principles that
underlie both are identical. The invention of the vacuum
tube can be said to mark the birth of Radio as it is known
today, and since then Radio has developed as a separate
science.
However, we can't start our study of Radio with the
vacuum tube--it is first necessary to get a thorough
knowledge of the principles of electricity so that when
we study the vacuum tube we shall be able to understand
both the "how" and the "why" of its construction and
operation. It is necessary to know something about
electricity, how it works, the different kinds of electricity there
are (every kind used in or has some connection with Radio).
You can be sure that you will not be expected to learn
anything that is not absolutely necessary for a copmlete
understanding of Radio, so give these first lessons as much
care and attention as you will give the later lessons dealilng
with Radio apparatus and its operation. You will be
learning Radio all the time, and you will be learning it
right--first getting a firm foundation on which to build.
A man would be foolish to attempt to build a beautiful
home on a weak foundation--we are not going to make
that mistake.
Just a word of warning. you may be tempted to "skip"
here and therre throughout these first lessons. Don't do it.
You may miss something that is absolutely essential.
Even though you may have some knowledge of electricity,
a thorough study of these lessons dealing with fundamental
principles will fill in the gaps and loopholes of
your present knowledge. Only by reviewing these fundamentals
in the light of recent developments will you get
the background needed for a complete understanding of later lessons.
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