Penny Blood: Serial Sensation and Working-Class Entertainment — page 58: what you’re looking at

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

cu. 1v.] LATERAL PRESSURE, ITS AMOUNT. 4I The reason why the ordinate of this curve contains 7’, is because it is obtained from the conditions of equilibrium of an element of an internal shell supporting, besides its own weight, part of that of the rock above it, so that, the thicker the shell, the less will be the lateral pressure on a unit of vertical section; because the vertical pressure is not proportional to the thickness of the shell, as it is in the case first considered of a shell at the surface of the earth. QOA=a It must be borne in mind that, in the two cases which have been discussed, r and +’ must be taken so small, that gravity and density may be considered constant through those thick- nesses, _ Resuming; It has been shown that the horizontal pressure 7’ on a unit of surface of a vertical section of a shell of thickness 7’ at a distance r from the centre will be > = < than the corresponding pressure at the surface, as the downward pressure P at that depth GONG oOo S (CO)