A compendium of astronomy; containing the elements of the science, familiarly explained and illustrated, with the latest discoveriesAdapted to the use of schools and academies, and of the general reader . n, are called Primitive tides. 201. Is the motion of the tide-wave progressive? if theocean completely covered the earth and the sun and moon werein the equator, how would the tide-wave travel ? What is themost correct way of conceiving of the tide-wave ? 202, How are the tides of rivers, &c. produced? Definecotidal lines. What does the cotidal line for any hour repre-sent? Distinguish betwee
A compendium of astronomy; containing the elements of the science, familiarly explained and illustrated, with the latest discoveriesAdapted to the use of schools and academies, and of the general reader . n, are called Primitive tides. 201. Is the motion of the tide-wave progressive? if theocean completely covered the earth and the sun and moon werein the equator, how would the tide-wave travel ? What is themost correct way of conceiving of the tide-wave ? 202, How are the tides of rivers, &c. produced? Definecotidal lines. What does the cotidal line for any hour repre-sent? Distinguish between Primitive and Derivative tides. TIDES. 163 203. The velocity with which the wave moves, willdepend on various circumstances, but principally on thedepth, and probably on the regularity of the the depth be nearly uniform, the cotidal lines will benearly straight and parallel. But if some parts of thechannel are deep while others are shallow, the tide willbe detained by the greater friction of the shallow places,and the cotidal lines will be irregular. The directionalso of the derivative tide, may be totally different fromthat of the primative. Thus, (Fig, 39,) if the great Fig. tide-wave, moving from east to west, be represented bythe lines 1, 2, 3, 4, the derivative tide which is propa-gated up a river or bay, will be represented by the co-tidal lines 3, 4, 5, 6, 7. Advancing faster in the channelthan next the bank, the tides will lag behind towardsthe shores, and the cotidal lines will take the form ofcurves as represented in the diagram. 203- On what will the velocity of the tide-wave depend ?What circumstances will retard it ? Explain figure 39. 164 THE MOON. 204. On account of the retarding influence of shoals,and an uneven, indented coast, the tide-wave travelsmore slowly along the shores of an island than in theneighbouring sea, assuming convex figures at a little dis-tance from the island and on opposite sides of it. Theseconvex lines sometimes meet and
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectastronomy, bookyear18
