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246 THE BOY ELECTRICIAN

antenna must be omitted, because each experimenter will
usually meet difierent conditions.

It should be remembered, hOwever, that the success of
the whole undertaking will rest largely upon the con-
struction of a proper aerial. The most excellent instru-
ments will not give very good results if connected to a poor'

 

 

 

 

 

 

c /l

xii—A—é-

     

GRID

T AERIAL
AERIAL ,

 

 

 

 

FIG. 199. — Various Types of Aerials.

aerial, while, on the other hand, inferior instruments will
often give fair results when connected to a good aerial.

The aerial should be at least thirty feet high.

The wire should not be smaller than N o. 14 B. & S.

The masts which support the aerial should be of wood
and provided with pulleys so that the wires may be lowered
any time it may be necessary. The mast should be thor-
oughly braced with stays or guys so as to counteraCt the
strain of the aerial.

The aerial should not be hoisted up perfectly tight,

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