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See also:PICKERING, See also:EDWARD See also:CHARLES (1846- ) , See also:American physicist and astronomer, was See also:born in See also:Boston on the 19th of See also:July 1846. He graduated in 1865 at the See also:- LAWRENCE
- LAWRENCE (LAURENTIUS, LORENZO), ST
- LAWRENCE, AMOS (1786—1852)
- LAWRENCE, AMOS ADAMS (1814–1886)
- LAWRENCE, GEORGE ALFRED (1827–1876)
- LAWRENCE, JOHN LAIRD MAIR LAWRENCE, 1ST BARON (1811-1879)
- LAWRENCE, SIR HENRY MONTGOMERY (1806–1857)
- LAWRENCE, SIR THOMAS (1769–1830)
- LAWRENCE, STRINGER (1697–1775)
Lawrence Scientific School of Harvard, where for the next two years he was a teacher of See also:mathematics. Subsequently he became See also:professor of physics at the See also:Massachusetts See also:Institute of Technology, and in 1876 he was appointed professor of See also:astronomy and director of the Harvard See also:College See also:observatory. In 1877 he decided to
devote one of the telescopes of the observatory to stellar See also:photometry, and after an exhaustive trial of various forms of photo-meters, he devised the See also:meridian photometer (see PHOTOMETRY, STELLAR), which seemed to be See also:free from most of the See also:sources of See also:error. With the first See also:instrument of this See also:kind, having objectives of 1.5 See also:inch See also:aperture, he measured the brightness of 4260 stars, including all stars down to the 6th magnitude between the See also:North See also:Pole and -30° See also:declination. With the See also:object of reaching fainter stars, Professor Pickering constructed another instrument of larger dimensions, and with this more than a million observations have been made. The first important See also:work undertaken with it was a revision of the magnitudes given in the See also:Bonn Durchmusterung. On the completion of this, Professor Pickering decided to undertake the survey of the See also:southern hemisphere. An expedition, under the direction of Prof. S. I. See also:Bailey, was accordingly despatched (1889), and the meridian photometer erected successively in three different positions on the slopes of the See also:Andes. The third of these was See also:Arequipa, at which a permanent See also:branch of the Harvard Observatory is now located. The .magnitudes of nearly 8000 southern stars were determined, including 1428 stars of the 6th magnitude and brighter. The instrument was then returned to See also:Cambridge (U.S.A.), where the survey extended so as to include all stars of magnitude 7.5 down to -40° declination, after which it was once more sent back to Arequipa. In 1886 the widow of See also:- HENRY
- HENRY (1129-1195)
- HENRY (c. 1108-1139)
- HENRY (c. 1174–1216)
- HENRY (Fr. Henri; Span. Enrique; Ger. Heinrich; Mid. H. Ger. Heinrich and Heimrich; O.H.G. Haimi- or Heimirih, i.e. " prince, or chief of the house," from O.H.G. heim, the Eng. home, and rih, Goth. reiks; compare Lat. rex " king "—" rich," therefore " mig
- HENRY, EDWARD LAMSON (1841– )
- HENRY, JAMES (1798-1876)
- HENRY, JOSEPH (1797-1878)
- HENRY, MATTHEW (1662-1714)
- HENRY, PATRICK (1736–1799)
- HENRY, PRINCE OF BATTENBERG (1858-1896)
- HENRY, ROBERT (1718-1790)
- HENRY, VICTOR (1850– )
- HENRY, WILLIAM (1795-1836)
Henry See also:Draper, one of the pioneers of stellar See also:spectroscopy, made a liberal See also:provision for carrying on spectroscopic investigations at Harvard College in memory of her See also:husband. With Professor Pickering's usual comprehensiveness, the inquiry was so arranged as to See also:cover the whole See also:sky; and with four telescopes—two at Cambridge for the See also:northern hemisphere, and two at Arequipa in See also:Peru for the southern—to which a See also:fine 24-in. photographic See also:telescope was afterwards added, no fewer than 75,000 photographs had been obtained up to the beginning of 1901. These investigations have yielded many important discoveries, not only of new stars, and of large See also:numbers of variable stars, but also of a wholly new class of See also:double stars whose binary See also:character is only revealed by peculiarities in their spectra. The important conclusion has been already derived that the See also:majority of the stars in the Milky Way belong to one See also:special type.
End of Article: PICKERING, EDWARD CHARLES (1846- )
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