The aim of this paper is to give the bridge designer a tool for an investigation of the aerodynamic stability of suspension bridges. To facilitate the reading of the paper the presentation, when possible, follows the methods of statics and the deflection theory of suspension bridges. Methods which are familiar to the bridge designers.nThe first part of the paper deduce equations for vertical and torsional oscillations, and results in some very simple formulae for the calculation of natural frequencies and modes of oscillation, see Chap. 2 and 3. In these formulas are included the effect of inclination of the suspenders. As will be seen from Fig 5 this effect is quite important for oscillations with 2 half waves in a span.
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