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station, and it may be some day that it will be your job among other things to see that your station maintains a con- stant frequency and stays at a certain wavelength to comply with the regulations of the Federal Radio Commission.
     Whenever you know any two of these three things, velocity, frequency or wavelength you can always find the other by means of these relations:

Velocity = Frequency X Wavelength	(1)
Frequency = Velocity s Wavelength	(2)
Wavelength = Velocity t Frequency	(3)

     In order to assist us in memorizing these formulas we make use of a number of symbols, as we call them, and instead of spell- ing out the words, velocity, frequency and wavelength, we just put in place of them these symbols.

Fig. 12----Picture showing how waves are produced in a pond by throwing a stone in the water at “A.” This stone starts a series of concentric ripples or waves, which spread out in all directions, affecting the piece of wood “B.” The stone “A” may be compared to a Radio transmitting station and “B” to a receiving station.

     For example, in Radio, we always use the letter v for velocity and for frequency we use the letter f and the Greek letter Lambda (l) is used for wavelength.
     So using our short-cut method we can rewrite the formulas given above.

V = f l	f = V / l	l = V / f
(Velocity equals frequency multiplied by wavelength)	(Frequency equals velocity divided by wavelength)	(Wavelength equals velocity divided by frequency)

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Content	©1931, National Radio Institute
Webpage	©1997, Nostalgia Air
Transcriber	Richard Lancaster