The three circuits: a study of the primary forces . Jupiters Belts. Our Figures 11 and 12 represent the usual appear-ance of Jupiter as seen in powerful telescopes; thelighter portions of their discs correspond to the deeperportions of his atmosphere. We notice that a frag-mentary belt has broken from the south tropical belt NIGHT-SIDE PHENOMENA. 119 and is apparently moving north to join the equatorialbelt. A similar but not so well defined fragmenthas parted from the equatorial belt and is movingnorth to join the north tropical belt. Compare thesefigures with any good sketch of this planet m
The three circuits: a study of the primary forces . Jupiters Belts. Our Figures 11 and 12 represent the usual appear-ance of Jupiter as seen in powerful telescopes; thelighter portions of their discs correspond to the deeperportions of his atmosphere. We notice that a frag-mentary belt has broken from the south tropical belt NIGHT-SIDE PHENOMENA. 119 and is apparently moving north to join the equatorialbelt. A similar but not so well defined fragmenthas parted from the equatorial belt and is movingnorth to join the north tropical belt. Compare thesefigures with any good sketch of this planet made at atime when the belt formations were well defined. Fig. Jupiters Belts. As we ascend mountains the temperature of theatmosphere decreases about one degree for every 300or 400 feet, and its density diminishes at about thesame rate. From which we learn that it is deeperabove the valley than above the mountains. Let the 120 THE THREE CIRCUITS. mountains be our barometer and examine their testi-mony. At the equator perpetual frost is found at an elevation ol about feet, at the 60c north lati-tude it is found at about 4000 feet. From this weare not to infer that the depth of the atmospherevaries to that extent ; nor need we suppose that itsdepth is the principal cause, but it is certainly one ofthe causes and it may be a more important one thanwe have considered it. One is apt to think that a- we proceed north orsouth from the equator, the perpetual frost line creepsdown the mountain sides with considerable regularityand that the irregularities that do occur are the effectof different exposures to the rays of the sun, or ofhumidity and o
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