The three circuits: a study of the primary forces . total eclipses of the sun through powerfultelescopes, we believe that no two of them will agreeas to the appearance of the phenomenon at the samemoment of time. 140 THE THREE CIRCUITS. Fig. 14 represents the appearance of the total solar eclipse that occurred December 22, 1870. Our figure is a copy of an engraving after a sketch made Fig. 14.* °y Professor J. R. Eastman, who wasone of the corps ofastronomers sent bythe Naval Depart-ment of the UnitedStates to the islandof Sicily to observethe engraving is apart of ProfessorEast
The three circuits: a study of the primary forces . total eclipses of the sun through powerfultelescopes, we believe that no two of them will agreeas to the appearance of the phenomenon at the samemoment of time. 140 THE THREE CIRCUITS. Fig. 14 represents the appearance of the total solar eclipse that occurred December 22, 1870. Our figure is a copy of an engraving after a sketch made Fig. 14.* °y Professor J. R. Eastman, who wasone of the corps ofastronomers sent bythe Naval Depart-ment of the UnitedStates to the islandof Sicily to observethe engraving is apart of ProfessorEastmans official re-port. The readerwill observe thatthere may havebeen something likeTotal Eclipse of the Sun, Dec. 22,1870. a so]ar auroral dis-play underway at the time of the eclipse. Fig. 15 represents the eclipse as seen by CaptainG. L. Tupman at the same time and place; again * In the original engravings there are noticeable phenom-ena which cannot be shown without the aid of colored Eastman says in his report, The third and. THE SOLAR ENIGMA. 141 the artist pictures something like an auroral dis-play. Professor Lockyers description of the sun spotsand his conclusions reads as follows : Some of the spots cover millions of square miles ; othersare visible only in power- jrIG. 15, ful instruments and areof very short is a great differ-ence in the number ofspots visible from timeto time; indeed, thereis a minimum periodwhen none are seen forweeks together, and amaximum period whenmore are seen than atother times. The inter-val between two maxi-mum or two minimumperiods is about elevenyears. Now as we mustget less light from thesun when it is covered with spots than when it . n n +1 Total Eclipse of the Sun, Dec. 22,1870. is free from them, we r may look upon it as a variable star with a period of eleven outer portion of the corona, on the western limb of the sunconsisted of three projections of light striated or of radial
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