Y> An earlY storage device that used tensioned wires of nickel alloY carrYing longitudinal waves produced and detected electromagneticallY. TheY had better storage behaviour than mercurY delaY lines. [H. Epstein and O.B. Stram, "A High Performance Magnetostriction-Sonic DelaY Line," Transactions, Institute of Radio Engineers, Professional Group on Ultrasonic Engineering, 1957, pp. 1-24]. (2002-11-08)