 | 1857 - 648 páginas
...years, the magnitude of the solar surface obscured by spots increases and decreases periodically, the length of the period beingeleven years and fortydays....interest to the study of the solar surface ; and, upon thi? suggestion of Sir John Herschel, a photoheliogiaphic apparatus has lately been established at... | |
 | 1857 - 782 páginas
...increases and decreases periodically, the length of the period being 11 years and 40 days. This remarkable fact, and the relation which it appears to bear to...the solar surface ; and upon the suggestion of Sir J >lm Herschel, a photoheliographic apparatus has lately been established at Kew, for the purpose of... | |
 | 1857 - 670 páginas
...surface obscured by spots inerei«es and decreases periodically, the length of the period being ele ven years and fortydays. This fact, and the relation which...terrestrial magnetism, have attracted fresh interest to t!ie study of the solar surface ; and, upon the suggestion of Sir John Herschel, a photoheliographic... | |
 | 1857 - 594 páginas
...decreases periodically, the length of the period being 11 years and 40 days. This remarkable fact, aud the relation which it appears to bear to certain phenomena...have attracted fresh interest to the study of the eolar surface; and, upon the suggestion of Sir John Herschel, a photoheliographic apparatus has lately... | |
 | 1857 - 520 páginas
...increases and decreases periodically, the length of the period being 11 years and 40 days. This remarkable fact, and the relation which it appears to bear to...terrestrial magnetism, have attracted fresh interest to the stndy of the solar surface; and, upon the suggestion of Sir John Herschel, a photoheliographio apparatus... | |
 | John Holmes Agnew, Walter Hilliard Bidwell - 1858 - 924 páginas
...increases and decreases periodically, the length of the period being 1 1 years and 40 days. This remarkable fact, and the relation which it appears to bear to...macular state of the sun's surface from time to time. It is well known that Sir William Herschel accounted for the solar spots by currents of an elastic... | |
 | Charles W. Vincent, James Mason - 1858 - 364 páginas
...increases and decreases periodically, the length of the period being 11 years and 40 days. This remarkable fact, and the relation which it appears to bear to...macular state of the sun's surface from time to time. It is well known that Sir William Herschel accounted for the solar spots by currents of an elastic... | |
 | 1858 - 448 páginas
...decreases periodically, the length of the period being eleven years and forty days. This remarkable fact, and the relation which it appears to bear to...macular state of the sun's surface from time to time. It is well known that Sir William Herschel accounted for the solar spots by currents of an elastic... | |
 | 1858 - 314 páginas
...increases and decreases periodically, the length of the period being 11 years and 40 days. This remarkable fact, and the relation which it appears to bear to...terrestrial magnetism, have attracted fresh interest to the stndy of the solar surface ; and, upon the suggestion of Sir John Herschel, a photoheliographic apparatus... | |
 | British Association for the Advancement of Science - 1858 - 670 páginas
...increases and decreases periodically, the length of the period being 11 years and 40 days. This remarkable fact, and the relation which it appears to bear to...phenomena of terrestrial magnetism, have attracted frebh interest to the study of the solar surface ; and, upon the suggestion of Sir John Herschel, a... | |
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... days. This remarkable fact, and the relation which it appears to bear to certain phenomena of terrestrial magnetism, have attracted fresh interest to the study of the solar surface ; and, upon the suggestion of Sir John Herschel, a photoheliographic... 
