http://www.collegehumor.com/picture:1241...
Other Answers (8)
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They are for aircraft so the pilots can see the liocation of the wires a slow plane travels at about 90mph and at that speed it is hard to see a cable at only 5/8 to1%26quot;3/4 at that speed
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I think they also keep the power lines steady in high winds, which is why I first saw them in a line that crossed over a lake.
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I believe it has to do with visibility. they are usually found across highways where a helicopter might have to land. Not sure though.
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It is to reduce the waves (caused by wind) that can bounce the wires and cause them to break over time.
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So planes can see them. They also steady the wires in high wind.
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for power surgers, and also it makes the power lines more see able.
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they keep the power lines from touching
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I also have understood they were for Planes to see.