Discussion of an Article by G. S. Ramaswamy and M. Ramaiah : characteristics equation of cylindrical shells : a simplified method of solution
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"Messrs. Ramaswamy and Ramaiah suggest an elegant procedure for determining the roots of the eighth-degree characteristic equation. The method consists of converting the eighth-degree equation into a biquadratic and then forming its cubic resolvent equation which in turn is solved by the use of Steinman's rule. The object of this discussion is to show that the roots of the biquadratic can be obtained directly by using an iterative procedure to determine the quadratic factors. This procedure eliminates the need for operating with complex numbers."--Page 1505.