The three circuits: a study of the primary forces . Herschel says: The disc of Jupiter is always observed to be crossed inone direction by dark bands or belts presenting the appear-ance in Plate III. Fig. 2; which represents this planet asseen on the 23d of September, 1832, in the twenty feet re-flector of Slough. These belts are, however, by no means * Other planets may not have belts. Jupiter undoubtedlyhas a very deep atmosphere. Also the inclination of his axisis only about 3°, and since the force involved is sometimesgreater and sometimes less, the condition of Jupiter is veryfavorable to
The three circuits: a study of the primary forces . Herschel says: The disc of Jupiter is always observed to be crossed inone direction by dark bands or belts presenting the appear-ance in Plate III. Fig. 2; which represents this planet asseen on the 23d of September, 1832, in the twenty feet re-flector of Slough. These belts are, however, by no means * Other planets may not have belts. Jupiter undoubtedlyhas a very deep atmosphere. Also the inclination of his axisis only about 3°, and since the force involved is sometimesgreater and sometimes less, the condition of Jupiter is veryfavorable to belt formation. 118 THE THREE CIRCUITS. alike at all times; they vary in breadth and in situation onthe disc (though never in their general direction). Theyhave been seen broken up and distributed over the wholeface of the planet; but this phenomenon is extremely running out from them, and subdivisions as repre-sented in the figure, as well as evident dark spots are by nomeans uncommon.—Outlines of Astronomy, sec. 512. Fig. 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. 12.
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