Science . a complete meridian circle and the parallelsof latitude about 27° north and 27° half-zones are depressed andelevated as shown in Fig. 9. The com-bined effect represented by the zonal har-monic and the tesseral harmonic of rank1 is a furrowed surface with an Arcticregion of depression extending southwardsin the direction of the Atlantic, a zone ofelevation which runs across the Atlantic,South America and Africa, and then turns. northwards at either end, a zone of de-pression with the same kind of contour,and an Antarctic region of elevation whichextends
Science . a complete meridian circle and the parallelsof latitude about 27° north and 27° half-zones are depressed andelevated as shown in Fig. 9. The com-bined effect represented by the zonal har-monic and the tesseral harmonic of rank1 is a furrowed surface with an Arcticregion of depression extending southwardsin the direction of the Atlantic, a zone ofelevation which runs across the Atlantic,South America and Africa, and then turns. northwards at either end, a zone of de-pression with the same kind of contour,and an Antarctic region of elevation whichextends northwards in the direction ofAustralasia. These regions are shown in Fig. 10. I have recorded the result ofcombining these two harmonies becausethey represent the particular effects thatwould be produced by the interaction oftwo causes—the rotation, and the eccentricposition of the center of gravity. Thethird type of harmonics of the third degree,the tesseral harmonic of rank 2, gives usa division of the surface into octants by
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