Sir Isaac Newton has demonstrated[21] That the Force of the Sun to move the Sea, is to the Force of Gravity, as 1 to 12868200. Let that be
S. G :: 1. n. Hence, S = G⁄n.
And that the Force of the Moon to raise the Sea is to Gravity, as 1 to 2031821. Let this be
L. G :: 1. s. Hence, L = G⁄s.
And since the Centrifugal force of the Parts of the Earth arising from its Diurnal Motion is to Gravity, as 1 to 291. Let this be
C. G :: 1. C. Then C = G⁄e. Hence,
S + L. C :: G⁄n + G⁄s. G⁄e :: 1⁄n + 1⁄s. 1⁄e :: 1. sn / (s + n) × e :: 1. 6031.
The same Philosopher has taught us[22] that the Centrifugal force raises the Water at the Equator above the Water at the Poles, to the height of 85200 Feet. Wherefore if that Force which is as 6031, raise the Ocean to 85200 Feet, the United forces of the Sun and Moon, which are as 1. will raise the same to 14 Feet, for 85200⁄6031 = 14. Proximé.
Now we know that the more easily the Waters can obey the Attraction, with the more Force are the Tides moved; but since, as Mr. Halley has determin'd it,[23] our Atmosphere is extended to 45 Miles, whereas the middle depth of the Ocean is but about half a Mile; it is plain, that the Air revolving in a Sphere about 100 times larger than that of the Ocean, will have a proportionably greater Agitation.
Besides, Rocks, Shelves, and the inequality of Shoars are a great stop to the Access and Recess of the Sea: But nothing repels the rising Air, which is also of such thinness and fluidity, that it is easily driven, and runs every way.