Time-delay networks for an analog computer

Time-delay networks suitable for an analog computer are designed by considering the location of poles and zeros in their transfer functions. The curve of phase shift against frequency should be a straight line. The negative slope of this curve is the time delay. Even-order derivatives of the curve automatically vanish at zero frequency. Roots of the transfer function are chosen to make vanish similarly as many as possible of the derivatives of odd order, higher than the first. Data are given for networks with one, two, three, and four pairs of roots.