will be able to hear the buzz quite distinctly in the head phones if
the buzzer is not too far away.

[Illustration: Figure 2]

The actual adjustment of the detector is rather a delicate job, and
once it is in the proper position it is a good plan to avoid jarring
it, as it is liable to get out of adjustment very easily.

Once the sensitive spot on your detector is found, slowly turn the
knob on your condenser and at some spot on it you should be able to
pick up signals of some sort, either of radiophone or spark. If the
set does not work, then go over all your wiring and be sure that the
windings of the two coils are both running the same way.

The above set will work well for short distances, say up to twelve or
fifteen miles. Beyond that, however, it will not receive music unless
you have unusual facilities for putting up an aerial to a considerable
height and well clear of surrounding objects.

Such a set should be constructed at a minimum of cost and may later,
after you have become familiar with the operation of radio appliances,
easily be converted into a set of much greater range by the use of a
vacuum tube as detector and may even, by slight changes, be given the
much desired regenerative effects.




CHAPTER I