FOREWORD
With this lesson we start what might well be called the "head work" of Radio. We have already gotten a very clear idea of the Radio process, we know the principles of electricity and its use in circuits on which Radio is based. Now we are going to learn how to work out problems of Radio with pencil and paper -- and it is this knowledge that marks the real Radio Expert.
Leave the guess work for the Radio "fixer" who trusts to luck and hopes that he'll be able to stumble onto the solution of a Radio problem. You don't want to have to tear down a whole set looking for the trouble--you want to go right to it without wasting any time. You want to be the kind of Radio Expert that can figure out on paper where the trouble must be, so you won't have to take each piece of the apparatus out and try to discover whether it is okay just by looking at it.
Many of the facts and methods you will learn in this lesson are expressed in the form of equations and formulas. It is not necessary to memorize all of them--just become familiar with them, learn how to use them, learn what they are used for. Then with use, they will become so familiar to you that you won't have to refer to the book for them--they will become a part of you--and you will have your knowledge where you want it--in your head and at your finger's ends.
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