In the case of the wire of the
right quality, the band of light may broaden a very little
at the turn, but there will be no roughnesses of surface.
By making this experiment two or three times one can
soon learn to know really bad wire from good, and also learn
to know the strength of hand necessary to bend the right
quality.
2. It must not be damaged. That is to say, it must be
unkinked, rustless, and unscored.
3. Now as regards keeping wire in good condition. Where
outside wires are concerned, they should be kept WELL GREASED
OR OILED, especially where bent over at the ends. Internal
bracing wires cannot be reached for the purpose of regreasing
them, as they are inside fabric-covered surfaces. They should
be prevented from rusting by being painted with an anti-rust
mixture. Great care should be taken to see that the wire
is perfectly clean and dry before being painted. A greasy
finger-mark is sufficient to stop the paint from sticking to
the wire. In such a case there will be a little space between
the paint and the wire. Air may enter there and cause the
wire to rust.
4. Tension of Wires.--The tension to which the wires are
adjusted is of the greatest importance. All the wires should
be of the same tension when the aeroplane is supported in
such a way as to throw no stress upon them. If some wires
are in greater tension than others, the aeroplane will quickly
become distorted and lose its efficiency.
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