Penny Blood: Serial Sensation and Working-Class Entertainment — page 63: what you’re looking at

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

46 ELEVATIONS AND DEPRESSIONS. {cu. v. same time contract, nor lose anything in volume by the com- pression to which it is subjected. Let ABCD be a layer of rock of unit of width, length /, and depth &. And suppose the abutments at AC and BD to approach each other through the space le, where e is a small _ ; mg — 2 Pe 7 es ey vane fraction, which we may call the coefficient of compression. Then the layer of rock in question would assume some new form, suppose one of those given in the figure, or any other whatso- ever conceivable’, Let us now seek for some simple laws which must govern the disturbed strata in spite of the confusion which appears to reign among them. Let a, a, &c., be the areas formed by the _ upper curved line above AB, and 8, 6, &c., the areas formed by the same line below AB. It is not necessary that the a’s should | be equal to one another, nor yet the 6’s. They are used simply to designate the areas in respect of their positions. We will ‘ call AB “The datum level.” In like manner let a, 8, be similar areas for the lower datum level CD. Then the space included between the curved lines , must be equal to A Cdb = ki (1 +e). It is also evidently equal to ACDB +a+a+&+84+ 8 + &. —b—b—&.—a—a—&e., 1 Some interesting experiments have been made by Prof. A. Favre of Geneva upon the effect of compression in raising elevations of a plastic substance. He placed a layer of clay upon a stretched band of Caoutchouc, and then allowed it to contract. A description of the experiments, and figures illustrating some of the results, which closely resemble the contortions sometimes seen in the earth’s strata, will be found in ‘“‘ Nature,” Vol. xrx. p. 103. See also Ch. x. seq. COMiCOOokxS.conn @