Page:Great Neapolitan Earthquake of 1857 Vol 2.djvu/335

270 side $$d$$ of the plane of junction (and of fissure $$k\ i$$), or it may slope from the less compressible medium, as in Fig. 349, and

towards the more compressible one at the side $$d$$, of the plane of junction, &c., as in the latter Figure, the same letters

referring to each figure. In both cases, the greatest axis of the two abutting and more or less distorted, semi-ellipsoids of wave movement, will be in the direction $$d\ s$$, perpendicular to the plane of junction of the media, and