Appendix to the Second Edition of Physics of the Earths Crust By the Rev Osmon
Appendix to the Second Edition of Physics of the Earths Crust By the Rev Osmon
Osmond Fisher
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Let us imagine the earth to be a sphere, (that is, we set aside the rotational effects) and that its surface is formed of flat land and water, all being at the mean level. But in fact, though we make this supposition for simplicity, if there be any flat tract of land at the ocean level it will suffice for our purpose. Our symbols are then assumed as follow : a radius of the sphere, c = the thickness of the crust at the sea board, p = its density there, taken, as hitherto, at 2 '6 8, k = the thi...ckness of the sub-oceanic crust at a place where the depth of the ocean is 8, 8 = the depth of the ocean at any place, p = the density of the sub-oceanic crust at that place, fj. = the density of the ocean, a the density of the liquid substratum, taken constant to the depth to which the rigid crust anywhere extends; and as hitherto assumed, equal to 2 '9 6. If the earth be taken as spherical, then gravity will be the same everywhere on its surface, however the matter of which it consists may be distributed ; for Professor Stokes has proved that, if the earth is a spheroid of equilibrium of small ellipticity, then, however the matter may be distributed, Clairaut's theorem holds good that, 9 = ~* I 1 + (I ~
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