Cable vibration — Methods of measurement

Test methods and equipment developed for the laboratory production in cables of vibrations (standing waves) similar to those experienced in transmission line service, and for determining the relative susceptibility of different cables to conditions tending to produce vibrations, are described. The special magnetic drive used to produce and sustain cable vibration has no friction loss except air friction, and hence is well suited to the measurement of the small amounts of power required to vibrate the cables.