Certified Radio-Trician's Course(REG. U. S. PAT. OFF.)
NATIONAL RADIO INSTITUTE
WASHINGTON, D. C.
The Language of Radio-Trician's
PHOTOGRAPHS, SKETCHES AND DIAGRAMS
The language Radio-Tricians use is more than a language
of words. The words are there, of course, and soon you will be
talking about "reactance" and "impedance" as easily as you
talk about "gasoline" and "horsepower" now.
But in addition to this new word language, Radio-Tricians
use what might be called an auxiliary or helping language, consisting
of sketches, symbols, diagrams, tables, graphs, equations
and formulas. All these must be considered as "helps" or "tools"
which Radio-Tricians use and in this book you will get a clear
insight into the nature and use of these "tools."
Suppose Lesson No. 1, which you just completed, did not
have any pictures or sketches at all. It would have been very
uninteresting possibly, even though the language used throughout
the book was very clear. The purpose of all languages is
to create pictures in the minds of readers or listeners, but often
the mental pictures formed are incomplete or inaccurate. Then
a simple photograph or sketch illustration will complete the
picture. The illustrations used in the previous lesson served to
complete many mental pictures for you, didn't they?
Now let us consider this "helping" language of Radio-Tricians.
We shall take up the various "tools," one at a time. Then
when you meet them in later text-books you will know how to
use them +hey will either create or complete mental pictures
for you. After all, the learning process is largely a storing up
of new mental pictures which can be brought into the conscious
part of your mind and made use of when needed.
In Radio, as in all engineering studies, the pictures which
must be transferred from the teacher's mind to the minds of
students' are frequently rather complicated. A word description
alone would often result in an incomplete or confused picture in
your mind. Suppose you had never seen a Radio set and somebody
attempted to describe it to you in words--we doubt if any
amount of word descriptions would give you an accurate picture
of a Radio and its operation. But if they show you photographs
