Theory of the tides

J. F. Ruthven
1910 Royal United Services Institution Journal  
BEFOIIK Sir Isaac Xe\vton revolutioniscq Piiysical Science there was no tidal theory worthy of the name. Then, in a cornparatively fe\v years, we had two, the equilibrium and the dynamicnl theories. The former 'was originally, i s . its name implies, \vliolly statical, hut it was leavened with dynamics before being displaced by the theory of I~p l n c e , wliich, of course, was Dcalini first for tlie sake of simplicity ivith the lunar tides 'oniy,'.the apices of the cones are, by the
more » ... , by the equilibrium theory. at the extremities of that dianieter of the earth yliicli is.directed to the ,moon'; .ivhiIst tlie dpnaniicnl 'theory, places them on an equatorial. diameter i t right angles to tlii.s, or in quadrature. A nioment's' reflection ivill sliqw that in the first case they will move h o r t h ' i d south as tlie'iiioon ch'angcs her declination, and that in the second they :must travel round . the equator wheth'erthe nioon 'is over it or tlie,?8,th parallcl of latitodc. .'The equilibri&; theor). was finally a!,andoned ~bccause in Great Britain h d Xorthern Europe the moon is often in or near the horizon, instead of on the. meridian, when it is high ivater, m d it was ass1inii.d that surface current \\'as the only .means of producing equilibrium, yhich tlie actual rates of revolution and rotation n u d e iriipossible..of attainnient,' ' In t!ie transition
doi:10.1080/03071841009424391 fatcat:x5y5kerg7famhersvdlin7wqna