Penny Blood: Serial Sensation and Working-Class Entertainment — page 151: what you’re looking at

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

134 DISTURBED TRACT. - fon. x. once formed must be permanent above the mean level, so far as denudation can affect it. In the position which the tract has now assumed, there will be at first a certain amount of residual horizontal pressure at PR and QS, because the rigidity of the crust opposes a resistance to the horizontal thrust, which is only able to distort it to a certain degree. Since however, with sufficient time allowed, any substance not absolutely rigid will gradually yield to distortion under the action of pressure, we may assume that eventually the pressures at PR and QS will disappear, and the mass of the tract be under the action of the vertical forces only; and that these will be in equilibrium. As we have drawn our diagram the centre of gravity of the mass bounded by PQ and RS will be at G. And since the resultant of the vertical forces acts through G, it follows that if the cross stresses at PQ and RS are just such as the crust will bear, and equal, G will be equidistant from PQ and RS. We have now arrived at the conception of a ridge, of which our diagram represents a section, steeper upon one side, say the west, than upon the other, the east, It is bordered by an ocean upon either side, The ocean extends beyond the limits of the tract disturbed, which is defined by P and fi, and is there of its average depth. But there are channels, corre- sponding to 2% (b), running parallel to the ridge, where the In this diagram the vertical scale is double the horizontal. The latter is somewhat reduced from the scale of the previous diagram. The shaded part is the sediment. The ocean level is omitted; and no attempt has beon made to represent the changes of level, which, although of the greatest importance, would have been scarcely visible upon the figure. TOOKS COLA @ (CO)