TC 9-64 _________________________________________________________________________
Figure 1-30. Relationship of E-Lines and Current Flow
Now that you have completed this chapter, let us review some of the new
terms, concepts, and ideas you have learned. You should have a thorough
understanding of these principles before moving on to chapter 2.
Wave propagation is an invisible force that enables man to communicate over
long distances. Wave transmission can take many forms, such as light, sound,
Light is a form of wave motion that can be seen. Heat cannot normally be
seen, but can be felt. Radio waves cannot be seen or felt.