Penny Blood: Serial Sensation and Working-Class Entertainment — page 193: what you’re looking at

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

176 AMOUNT OF COMPRESSION. (cu. xm. with and prolongations of the first, may be considered as sub- marine elevations, and it is possible that they may be the re- mains of ancient lands levelled down. The third which occupy the larger portion of the oceanic area we will regard as indi- cating the mean upper level of the crust. The fourth and fifth will then be depressions below it, corresponding to the series > (B’). If then we set the fourth and fifth against the first and second, we shall have remaining for the excess of > (A’) over 2 (B’) only the volume of the continents above the mean level. If we then adopt Prof. Haughton’s estimates’ for Z the area of the land, and for its mean height h above the sea, 6 being the depth of the sea over the area which we take as defining the mean level, we shall have, [ = 52 x 10° square miles, h = 1000 feet = 0:19 mile nearly, 6 = 3'5 miles. Then > (A’) — > (B’) = 52 x 10° (3°5 + 0:19) cubic miles, = 52 x 3:69 x 10° cubic miles. If we put r= 4000 miles, k = 20 miles, 7 : (r—kP 1 Ol, and P= 9:57, o—p and introduce these values into the expression for e, we find for the first term, 0°254. As regards the second term, it depends upon the water displaced by rock owing to the elevation. Now we have, in the above classification of the ocean depths, Nos. (1) and (2) which are less than the mean, and therefore cover upraised crust. We have also Nos. (4) and (5) which are greater than the mean, and therefore cover depressed crust. All these be- long to the disturbed regions, and consequently we may roughly set them off against one another. 1 p. 55. COMIC OOOKS.EO