Penny Blood: Serial Sensation and Working-Class Entertainment — page 183: what you’re looking at

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

166 THE REVELATIONS OF [oH. xt. This is the general relation upon our view of the constitution of the outer parts of the globe, and suffices to explain the col- lection of water in the oceanic areas, and it shews that the crust beneath the ocean must be more dense than beneath the continents, for if we make p'=p we get for & the value on p. 164 which makes it much less than it can possibly be. This greater density is in accordance with observations made with the pendulum, by which it has been found that gravity has a larger value at oceanic stations. In order that the crust may not sink into the fluid we must have p’ less than o. If then we put p =a in (1), this gives a limiting value for c and it 1s on Za!s c—p With the values previously assumed this gives 6°86 7 In this case k is of course indeterminate, for if the crust 1s of the same density as the fluid its position of equilibrium will be independent of its thickness. With the same values for p and o we may write (2°96 — p’) k = 0°28c — 6°86. This is the equation to.a rectangular hyperbola, in which the abscissa is the difference of the densities of the fluid substratum and the sub-oceanic crust, and the ordinate the thickness of that crust. Since p’ cannot be greater than o or than, .as assumed, 2:96, (o — p)c must be greater than (o —1)8; or, as assumed, 0'28c > 6°86, . €> 245. Or the thickness of the crust at the sea-level is not less than about 25 miles. It will be noticed that this is the first time, as far as the author is aware, that any estimate whatever regarding the thickness of the crust has been arrived at entirely independent of considerations of temperature. It 1s remarkable COLA @ NOOKS (CO)