The ACA vibration damper (U.S. Patent 3,052,747) is an energy dissipation device for removing the energy of vibration imparted to a conductor by wind. Conductor vibration induces a relative motion between the clamp and the inertia weights which causes fl exure of the steel cable, resulting in dissipation of mechanical energy by friction between the strands of the damper cable. In contrast to most tuned damping devices, which operate best only near their natural frequencies, the ACA vibration damper is designed for efficient transfer and dissipation of energy for the entire spectrum of frequencies that occur on transmission lines. For a detailed discussion see “Panel Discussion on Aeolian Vibration.” Part IV, EEI Transmission and Distribution Committee, January 1972.