Penny Blood: Serial Sensation and Working-Class Entertainment — page 71: what you’re looking at

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

54 ELEVATIONS AND DEPRESSIONS. [cu. v. our equation by subtracting X from the actual volume of the ocean, so that BD —X = (S+L)d— (8rrke — W). Observing that ¥+ ZL is the whole area of the globe, and there- fore equals 47r7*, and that eI would be the depth of a layer of water of the volume of X if it were equably spread over the whole globe, which depth we will call 6, the above equation gives, d+8- vol. of sea — vol. of land — area, of the globe The area of the ocean is estimated to be 146 millions of square miles, and that of the land 51 milhons”*. Mr J. Carrick Moore* has shown that Sw John Herschel was misled by an inaccurate expression in “The Cosmos” in his estimate of the mean height of the land being 1800 feet’, and that it ought to be put at half that, or 900 feet. The average depth of the ocean is reckoned at three miles, and its volume at 438 millions of cubic miles. By substituting these numbers we obtaim Qhe = d +8 — 2°2. —¢ ee A D } -B AB the datum level. SS the sea level supposed parallel to it. O the actual surface of the ocean. S’S’ the surface of the accumulated water levelled down. 0,D=d, O’D=d +8. 1 Herschel’s ‘‘ Physical Geography,” second edition, p. 19. 2 «‘ Nature,” Vol. v. p. 479. _ % “ Physical Geography,” p. 118. commiclsoolkks (CO)