The best
method is to pass a piece of wire through the hole in its centre,
and to use that as a lever. When the correct adjustment
has been secured, the turnbuckle must be locked to prevent
it from unscrewing. It is quite possible to lock it in such a
way as to allow it to unscrew a quarter or a half turn, and
that would throw the wires out of the very fine adjustment
necessary. The proper way is to use the locking wire so
that its direction is such as to oppose the tendency of the
barrel to unscrew, thus:
WIRES.--The following points should be carefully observed
where wire is concerned:
1. Quality.--It must not be too hard or too soft. An
easy practical way of learning to know the approximate
quality of wire is as follows:
Take three pieces, all of the same gauge, and each about a
foot in length. One piece should be too soft, another too hard,
and the third piece of the right quality. Fix them in a vice,
about an inch apart and in a vertical position, and with the light
from a window shining upon them. Burnish them if necessary,
and you will see a band of light reflected from each
wire.
Now bend the wires over as far as possible and away from
the light. Where the soft wire is concerned, it will squash
out at the bend, and this will be indicated by the band of
light, which will broaden at that point. In the case of the
wire which is too hard, the band of light will broaden very
little at the turn, but, if you look carefully, you will see some
little roughnesses of surface.
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