Page:Great Neapolitan Earthquake of 1857.djvu/193

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VARIOUS FORMS OF BUILDING.
145

gravity above the base of fracture, as in the preceding

equations, or of Fig. 104, and Equations XII., XIII., &c., &c., in which

and , as before, the distance of the centre of gravity from the axes of inceptive rotation, we have

(XXIX.)

The sign applying to the first semiphase, and that to the second semiphase of the wave.

7th. In the case of a solid cube, fractured from its horizontal base, by subnormal wave.

Substituting for its value, and also for ,

we obtain

(XXX.)
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