From: jmichael@vnet.IBM.COM
Subject: Electric power line "balls"
Article-I.D.: almaden.19930406.142616.248
Lines: 4

Power lines and airplanes don't mix. In areas where lines are strung very
high, or where a lot of crop dusting takes place, or where there is danger
of airplanes flying into the lines, they place these plastic balls on the
lines so they are easier to spot.