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The elastic behaviour under stress of framed structures, provided they are of simple construction, generally admits of mathematical treatment. When it is remembered, however, thatin many cases it is not possible to estimate the actual strength of a structure from stress calculations alone, we are obliged to turn to experiments in some form or another,particularly when the structure under investigation is of complicated design. The best experiments, perhaps, are those with models satisfying the law of similitude : the oft-used models made of thin metal strips are of little value unless for certain demonstration purposes. By the well known method of dimensional homogeniety, it can be proved that the ultimatestrength (a)of a structure subjected to harmonic oscillation is given by

On a Dynamical Model for Investigating the Collapse of Wooden Houses in an Earthquake