Preface
It is over ten years since I wrote the first edition of this book and it seems today that almost everything about the subject has changed except for the laws of physics. As a result there are many things in this edition which have changed beyond recognition, contrasting with some basics which have not changed at all.
Back then I felt that the approach of many technical books limited them to mathematically inclined readers of a certain level, and I resolved to write something where the mathematics were replaced with plain English and where statements were replaced by explanations. I also felt strongly that theories would be much more readily understood if they were illustrated by examples in practical equipment. In short, I wrote a book ...
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