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270 THE BOY ELECTRICIAN

be confused with those of another station when both are
working at the same time.

   

    

k

WIRE

, pan." 81’8"

     

 
  

CLIP

K

1‘ lllfifflm‘mw'
(MW ......
\ ~-———-‘-—""‘ "- """ "L:
I

    
  
 

'(\

 

 

\\ Bumme-
POST

FIG. 226. —A Helix and Clip.

An oscillation transformer consists of two helixes ar-
ranged so that one acts as a primary and the other as a
secondary. An oscillation

pew, R”- helix may be made by

making two sets of helix
frames similar to that in
Figure 226. The primary
should be provided with
" l eight turns of brass ribbon-

Jecondary

 

 

mz’ou/ d h o h
I our an t e secondary w1t

twelve. The primary sup-

ports a stifi brass rod

p3; °fi upon which the secondary

ting?- is mounted. The second-
Frc. 227. — An Oscillation Transformer. ary should slide .up and

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