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132 THE BOY ELECTRICIAN

A fine fiber for suspending the needle may be secured by
unraveling a piece of embroidery silk.

The upper end of the fiber is tied to a small hook in the
end of the arm. The wire hook may be twisted so that

ARM
1F—_——-—"——-

,ruRElo

   
 
  
 

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FIG. 11 5. — Completed Astatic Galvanometer.

the needles may be brought to zero on the scale. Zero
should lie on a line parallel to the two coils.

The fiber used for suspending the needles should be as
fine as poséible. The finer the fiber is, the more sensitive
will the instrument be.

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