This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...until the tension of the cord prevents any further separation. Its tension will then measure the " lifting force" of the moon which tends to ...Read MoreThis historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1888 Excerpt: ...until the tension of the cord prevents any further separation. Its tension will then measure the " lifting force" of the moon which tends to draw both the particles A and B away from C. 468. The Sun's Action.--This is precisely like that of the moon, except that the sun's distance, instead of being only sixty times the earth's radius, is nearly 23,500 times that quantity. Since the tideraising power varies as the cube of the distance inversely, while the attracting force varies only with the inverse square, it turns out that although the sun's attraction on the earth is nearly 200 times as great as that of the moon, its tide-raising power is only about twofifths as much. When the sun is over head or under foot, his disturbing force diminishes gravity by about-5-5-5-0xns 469. Statical Theory of the Tides.--If the earth were wholly composed of water, and if it kept always the same face towards the moon (as the moon does towards the earth), so that every particle on the earth's surface was always subjected to the same disturbing force from the moon, then, leaving out of account the sun's action, a permanent tide would be raised upon the earth, distorting it into a lemon-shaped form with the point towards the moon. It would be permanently higher water at the points A and B (Fig. 152) directly under the moon, and low water all around the earth on the circle 90 from these points, as at I and E. The difference of the level of the water at A and D would in this case be about two feet. The sun's action would produce a similar tide superposed upon the lunar tide and having about two-fifths of the same elevation. If the two tide summits should coincide, the resulting elevation of the high water would be the sum of the two separate tides. If the sun were 90 f...Read Less
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