Continued from the previous papers1)2), the mechanical characteristics of plywood shallow shells is analysed. Since it is very difficult to solve the fundamental equations (1) and (2) precisely for the geometrically nonlinear analysis3) of the orthotropic shallow shells, the authors attempted to get the numerical solution of them, as shown in the previous paper, by applying the finite difference method3)4) with the aid of the large scale digital computers Kyoto Univ.), and succeeded in solving

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... hem with good accuracy. To compare the behavior of the orthotropic plywood shells with that of isotropic shells, the isotropic elastic moduli which are equivalent to those of the orthotropic shells were derived (Eqs. (3)