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The Radio Amateur's Hand Book Chapter 16 CONTINUOUS WAVE TELEGRAPH TRANSMITTING SETS WITH DIRECT CURRENT 
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The Radio Amateur's Hand Book Chapter 16 CONTINUOUS WAVE TELEGRAPH TRANSMITTING SETS WITH DIRECT CURRENT Chapter 16 CONTINUOUS WAVE TELEGRAPH TRANSMITTING SETS WITH DIRECT CURRENT
In the first part of this book we learned about spark-gap telegraph sets and how the oscillations they set up are damped and the waves they send out are periodic. In this and the next chapter we shall find out how vacuum tube telegraph transmitters are made and how they set up oscillations that are sustained and radiate waves that are continuous.
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