649 



Ritchie 



Ritter. 



600 



I.ectura super Ptolemaei qiiadnparlKuni. U 

 comeiUo sopra l'alinageslo di Tolomeo. 



Ritchie, William. — Dr.Jur., Geist- 

 licher, eist Rector d. königl. Academie zu 

 Tain in Inverness-Shire, dann, nachdem 

 er sich ifi Paris zum Physiker ajsgebiidet, 

 seit 1829 in London lebend und daselbst 

 seil 1832 Prof. d. Physik u. Astronomie an 

 d. London-Universily, sowie Prof. d. Phy- 

 sik an d. Royal Institution. Mitgl. d. Roy. 

 Society (An. R. \ 8 37; fG. \ OJ (Abstr. IV)' 



geh , Schollland, 



gest. «83.7, Sept. t5, Portoliellob. Edin- 

 burgh. 

 On a new photomelor to determine tbe rela- 

 live iulensities of artificiai li^ht etc. (Fhil. Tr. 

 4Sä5;. On a iiew foim of Ihe difTereiilial Iher- 

 moiiittcr (Ib. 1827;. Oi> itie penneability of 

 Irc'in.vpnrenl screens of extreme lenuity by ra- 

 diaot beat (Ib. id ). On electric condurtion 

 fib. <828j. On the electric and chemical thoo- 

 ries of galvanism [Ib. 1839). On the elaslicily 

 of threads of g!ass, and applicalions of tiüs 

 property to torsion balances Ib. 1830;. He- 

 searches in Voltaic eiectricity (Ib 1832). Re- 

 searches in electio-magnetism (Ib. 1833). — 

 On the phenomena of endosmose and e.\os- 

 niose (Abstr. III, gelesen in d. Roy. .Soc. 1831). 

 On the law, which connecls the various luoi;- 

 neto-electric phaenomena lalely discovered 

 by Dr. Faraday (Ib., belesen 1832). On the 

 discrepancy belween llie velocity of sound in 

 air and tbat of thcory (Ib., gelesen 1837). 

 Exprm. Researches on the conducting powers 

 of wires for eiectricity ; and on the heat de- 

 veloped in metallic and liquid conductors (Ib. 

 id.). — On a n(fw rnethod of dravving a tan- 

 gerit to a circle (PhilLipa, .\nn. of Phil. 1, 1831). 

 Proposal for propelling steam ve^sels by hori- 

 zontal motion instead of circular (Ib. IV, 1822). 

 Od Powell'a paper on radiant heat (Ib. XII, 

 1826). On an air pump without artificiai val- 

 ves ilb id.). — On the povser of on electro- 

 magnet to rclain ils magnetism afler the bat- 

 tery has been remo\ed ;Phil. Mag. Ser. III, 

 Vol HI, 1833 . On the rotation of closed vol- 

 taic circuits (Ib. Vol. iV, 183 4). On the de- 

 tonation of o\yi.',en and hydrogen by a nuigrie- 

 tic spark (Ib. id.). On certain dilTerences be- 

 lween the permanent and the eleclro-magnel 

 (Ib. IX, 1S36). On certain improvemonts in 

 Ihe magneto-cloctric machine (Ib. id.). On 

 Rainey'i, Mac Gaulay's and Callan's thenrios 

 of magnetic rcnclion (Ib. X, 1837). On New- 

 ton'a rings and Ihe fixed lines of Ihc spectrum 

 (Ib. id.). On the electric spark and .shock froru 

 a permanent magnet (Ib. id.). — On Leslie's 

 Photometer (Brewster's Journ. of Science, II 

 et III, 1825). Improvement of the Phanlas- 

 magoria (Ib. IV, 1826). On an exlromely cheap 

 and delicaie hydrostatic bolance ;lb. VI, 1S2fij. 



Rügen, Ferdinand Franz von. — 

 Dr. Ried. (1808) u. Phil. (J8»3). Prof. d. 



Geburtshiilfe u. Chirurgie an d. Univ. zu 

 (iiessen seit 1816. Geb. Medicinalralh. Ge- 

 adelt seit 1839 (ScJ fJustiJ, 



geb. 1787, Oct. 11, Wulfen, Grafscb. 

 Salm-Salm. 

 Über die nächste Ursache der Hewegung der 

 Himmelskörper, S", Wien 1832. — Lherd. Ein- 

 tUiss d ver.schitMid. A,\en auf d. Krystaligestal- 

 (ung u. über eine diesem lunllus.se entspre- 

 chende -Bt'zeichn. (Leonhard u. Bronn's .lahrb. 

 1833;. — CbtT chenii.sche Nomenciatur (Lieb. 

 Ana. 111, 1832). — Viel Medicinisches. 



Rittenhouse, David. — Dr. Juris. 

 Anfangs Uhrmacher u. Mechanicus in Phi- 

 ladelphia, später \erschiedene oirentliche 

 Aemler im Staate Pennsyhnnien beklei- 

 dend , z. B. das des Schatzmeisters von 

 1777 bis 17 89, das des Miinzmeisters der 

 Vereinigten Staaten von 1792 bis 1795; 

 war auch 177 9 u. 17 86 mit Regulirung d. 

 Gränzen von Pennsylvanien beschäftigt. 

 Mifgl u. seit 1791 Präsident der American 

 Philosophical Society, auch Mitgl. d. Roy. 

 Society in London (AAßj fCAL), 



geb. 17 3 2, Apr. 8, Germantown bei 

 Philadelphia, 



gesl. 1%7 9 6, Juni 2 5, Philadelphia.* 

 An easy method of deducing the time of the 

 sun's passing the meridian per clock, without 

 the help of Ihe cquation tables, by equal alli- 

 tudes taken on two succeding days (TransDcl. 

 Americ. Soc I, 1785). A new orrery (Ib. id ;. 

 Calculations of the transit of Venus over tbe 

 Sun, 3 June 17C9 (Ib. id.). Obs. on the comet 

 ofJune and July 1770, with the elements of 

 ils motion etc. (Ib. id.). New method of placing 

 a meridian mark (Ib. II, l 786). An optical pro- 

 blem proposed by F. Hopkinson and solved by 

 D. R. (Ib. id.). Explanation of an optical dc- 

 ception (Ib. id.). Some experiments on magne- 

 tism (Ib. id.). On a remarkable meteor seen 

 in Virginia and Pensylvania (Ib. id.). Method 

 of finding the sum of the several powers of the 

 sines (Ib. III, 1793). Account of several houses 

 in Philadelphia, Struck with lightning (Ib. id.). 

 Account of the effecls of a slroke of lighlning 

 on a house furnished with two conductors; 

 mit F. Hopkinson (Ib. id.). To determine the 

 true place of a planet in an elliptic orbil di- 

 rectly frum the mcan anomaly by converging 

 series;Ib IV, 1799). On the expansion of wood 

 by ht^at (Ib. id.). On the improvement of the 

 limckeeper (Ib id.). Method of raising llie 

 common logarithm of any nurnber immedia- 

 loly ilb id.). Noch einige astron. Beobb. in 

 diesen Transact. u.den Phil.Tr. 1769u. 1770. 



• yst. Juni 20 (ZC. Vll) (LB) ; M.\i 29 [Br). 



Ritter, Franz. — Pfarrer in Slockels- 



berg bei Alloif (J', 



geh Nürnberg, 



gesl. t G i i clwa, 



