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See also:ROWLAND, 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:AUGUSTUS (1848-1901) , See also:American physicist, was See also:born at Honesdale, See also:Pennsylvania, on the 27th of See also:November 1848. From an See also:early See also:age he exhibited marked scientific tastes and spent all his spare See also:- TIME (0. Eng. Lima, cf. Icel. timi, Swed. timme, hour, Dan. time; from the root also seen in " tide," properly the time of between the flow and ebb of the sea, cf. O. Eng. getidan, to happen, " even-tide," &c.; it is not directly related to Lat. tempus)
- TIME, MEASUREMENT OF
- TIME, STANDARD
time in See also:electrical and chemical experiments. At the See also:Rensselaer See also:Polytechnic See also:Institute at See also:Troy, N.Y. he graduated in 1870, and he then obtained an engagement on the Western New See also:York railway. But the See also:work there was not to his liking, and after a See also:short time he gave it up for an instructorship in natural See also:science at the university of See also:Wooster, See also:Ohio, which in turn he resigned in See also:- ORDER
- ORDER (through Fr. ordre, for earlier ordene, from Lat. ordo, ordinis, rank, service, arrangement; the ultimate source is generally taken to be the root seen in Lat. oriri, rise, arise, begin; cf. " origin ")
- ORDER, HOLY
order to return to Troy as assistant See also:professor of physics. Finally, in 1876, he became the first occupant of the See also:chair of physics at the Johns See also:Hopkins University, See also:Baltimore, a position which he retained until his premature See also:death on the 16th of See also:April 1901. Rowland was one of the most brilliant men of science that See also:America has produced, and it is curious that at first his merits were not perceived in his own See also:country, In America he was unable even to secure the publication of certain of his scientific papers; but Clerk See also:Maxwell at once saw their excellence, and had them printed in the Philosophical See also:Magazine. When the managers of the Johns Hopkins University asked See also:advice in See also:Europe as to whom they should make their professor of physics, he was pointed out in all quarters as the best See also:man for the See also:post. In the See also:interval between his See also:election and the See also:assumption of his duties at Baltimore, he studied physics under See also:Helmholtz at
See also:Berlin, and carried out a well-known See also:research on the effect of an electrically charged See also:body in See also:motion, showing it to give rise to a magnetic See also:- FIELD (a word common to many West German languages, cf. Ger. Feld, Dutch veld, possibly cognate with O.E. f olde, the earth, and ultimately with root of the Gr. irAaror, broad)
- FIELD, CYRUS WEST (1819-1892)
- FIELD, DAVID DUDLEY (18o5-1894)
- FIELD, EUGENE (1850-1895)
- FIELD, FREDERICK (18o1—1885)
- FIELD, HENRY MARTYN (1822-1907)
- FIELD, JOHN (1782—1837)
- FIELD, MARSHALL (183 1906)
- FIELD, NATHAN (1587—1633)
- FIELD, STEPHEN JOHNSON (1816-1899)
- FIELD, WILLIAM VENTRIS FIELD, BARON (1813-1907)
field. As soon as he was settled at Baltimore, two important pieces of work engaged his See also:attention. One was a redetermination of the See also:ohm. For this he obtained a value which was substantially different from that ascertained by the See also:committee of the See also:British Association appointed for the purpose, but ultimately he had the See also:satisfaction of seeing his own result accepted as the more correct of the two. The other was a new determination of the See also:mechanical See also:equivalent of See also:heat. In this he used See also:Joule's See also:paddle-See also:wheel method, though with many improvements, the whole apparatus being on a larger See also:scale and the experiments being conducted over a wider range of temperature. He obtained a result distinctly higher than Joule's final figure; and in addition he made many valuable observations on thermometrical questions and on the variation of the specific heat of See also:water, which J. P. Joule had assumed to be the same at all temperatures. In 1882, before the See also:Physical Society of See also:London, he gave a description of the diffraction gratings with which his name is specially associated, and which have been of enormous See also:advantage to astronomical See also:spectroscopy. These gratings consist of pieces of See also:- METAL
- METAL (through Fr. from Lat. metallum, mine, quarry, adapted from Gr. µATaXAov, in the same sense, probably connected with ,ueraAAdv, to search after, explore, µeTa, after, aAAos, other)
metal or See also:glass ruled by means of a See also:diamond point with a very large number of parallel lines, on the extreme accuracy of which their efficiency depends. For their See also:production, therefore, dividing engines of extraordinary trueness and delicacy must be employed, and in the construction of such See also:machines See also:Row-See also:land's See also:engineering skill brought him conspicuous success. The results of his labours may be found in the elaborate Photo-graphic See also:Map of the Normal See also:Solar Spectrum (1888) and the Table of Solar See also:Wave-Lengths (1898). In the later years of his See also:life he was engaged in developing a See also:system of multiplex telegraphy.
End of Article: ROWLAND, HENRY AUGUSTUS (1848-1901)
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