Penny Blood: Serial Sensation and Working-Class Entertainment — page 126: what you’re looking at

Machine-transcribed from the original scan — historical spelling and the odd misread are preserved.

cH. 1x.] CRUST NOT FLEXIBLE. 109 Then we have for the equilibrium of PQ, sin @=t and — cos @= P x PQ. The first of these equations combined with (1) p. 101, and with the equation to the circle, will give the position of the point P to which PQ will descend, balancing the curve below it in the same manner as 1t would be balanced if the curve were continuous above instead. The fluid-pressure need not be altered by the above sup- position, because the general pressure will keep the anticlinal filled, although some of it should tend to escape above PQ. But if the crust which was upon the other side of the anticlinal, surmounts it, and follows PQ down the incline, it will produce compression above Q, and it seems that Q must, in that case, descend to the synclinal, where if p be less than o@ it will float and not disturb the general form of the curve beyond it. PQ, while thus descending, will force up the crust on the other side of the festoon, which in its’ turn surmounting the anticlinal, will descend the next incline. These changes, however, will take place rather by a relative movement of the liquid, than by an absolute movement of the crust, and will cause alternate elevation and depression of any given point in the crust. If the conditions of perfect fluidity in the liquid and perfect flexibility in the crust were fulfilled, and the crust were of insensible thickness, then our result would be true, and the festoons be all equal circular arcs. But under such circum- stances as may be supposed to exist in nature, these conditions would be so imperfectly fu'filled, that all we can assert is that the above considerations will serve as a rough guide to what we might expect to occur. The conditions of equilibrium would be satisfied from point to point not very widely distant from each other, and we might expect the compression to be distributed unequally. Hence the festoons would be larger, and the anticlinals higher, in some regions than in others. The local thickenings of the crust would also render the forms of the curve locally to differ from the normal form. The effect GONG oOo SS (CO)