pencawang elektrik

before i forget, i better post it here for joey. he asked sometime ago, what is the round, ball like thingy on the pencawang elektrik... so, i asked one of the engineer at my office. he said, they are sort of caution thingy for planes... and at night, pilot can see them. so, tak de la berlanggar dengan pencawang elektrik tu :) i just took this pic somewhere from the internet just to show what joey asked....

see the ball-like thingy hanging there? :)