oll 



Potts 



Pouillet. 



512 



optics, 2 vol. 8°, Ib. 1852. Physical optics or 

 tfae nature and properUes of light, 8°, Ib. 4856. 

 — Mathematical considerations on the pro- 

 blerr of Ihe rainbow etc. (Tr. Cambridge Phil. 

 See. Vol. VI, pt. I, 1836). On a new correction 

 in the construction of the double achromatic 

 object-giass (Ib. pt. III, 1838). Caicuiations 

 of the heights of the aurorae boreales of the 

 i 7"> Sept. and i 2»'' Oct. 1 833 etc. (Ib. Vol. VIII, 

 pt. III, <847i. — Experiments to determine 

 tiie quantity of light reHected by plane metal- 

 lic specula under different anglesof incidence ; 

 wilh a dc-^cript. of the photometer made use 

 Ol (Brewster, Journ. of Sc. Vi, 1830). On im- 

 proved methods of Casting and grounding spe- 

 cula for reflecting telescopes (Ib. IV, 1831 et 

 VI, 18 32;. On the reflective powers of glass 

 (Ib. id.). On the determination of the position 

 of the aurorae boreales (Ib. V, 1831). On the 

 specific heats of tnetals (Ib. id. et VI, 1832). 

 On a new construct. of Newton'« microscope 

 (Ib. VI, 1832). — On giving conic sectional 

 figures to lenses etc. (Phil. Mag. Ser. III, Vol. I, 

 1832). On the reflexion at the second surface 

 of flintglas at incidences of total reflexion (Ib. 

 id.). On a new photometer (Ib. id. et XII, 

 1838). On a particular modißoation of the in- 

 terference of homogeneous iight (Ib. II, 1833). 

 Reply to Airy's remarlcs on this paper (Ib. id.). 

 On a new heliostat (Ib. id.). On two arches of 

 aurorae borealis (Ib. id.). On a brillant arch 

 of an aurora boreales (Ib. III., 1833). On the 

 velocily with which light traverses transpa- 

 rent media (Ib. id.). On the reflexion of light 

 by glasof antimony (Ib. IV, 1834). On the pri- 

 raary and secondary raiubows (Ib. XIII, 1838). 

 On phütomelry etc. (Ib. XVI, 1840). On in- 

 lerferences, as an e.\perimentura crucis as to 

 the nature of light (Ib. id.). On Huyghen«'prin- 

 ciple applied to physical optics (Ib XVII, 1 8*0 

 et XVIII, 1841;. On conical refraction in bi- 

 axial crystals (Ib. XVIII, 1841). Oo the pfae- 

 nomena of diffraction in the shadow of a cir- 

 cular diso (Ib. XIX, 1341). On Ibe discovery 

 of the chilling process in the casting of the spe- 

 cula for reflectiag telescopes Ib. XXXIV, 1849]. 

 On the supposed inversion of hydrostatical 

 principles in the casting of specula for reflect- 

 ing telescopes (Ib. XXXVI, 18.50). On the aero- 

 metric balance, an instrument for measuring 

 the density of air (Ib. XXXVII, 1850). — On 

 the Solution of the problem of sound (Ib.Ser. IV, 

 Vol. I etil, 1851). On hydrodynamics (Ib. I, 

 1851). On the fourth law of the relalions of the 

 elaslic force, density and temperatureof gases 

 (Ib. VI, 1853). Oo the interference of light 

 near a caustic, and the phaenomena of rain- 

 bow (Ib. IX, 1855). On the principle ofKicol's 

 rhomb, and some improved form of therhombs 

 for procuring beams of plane-polarized light 

 (Ib. XIV, 1857 et XVI, 1858). 



Potts, Lawrence Holker. — Dr. 

 Med. (I82.J). Er.st Chirurg bei der Devon- 

 II. Cornwall-Miliz in Truro (1812), dann 

 Director d. ('ornwalier Irrenanstalt (1 828), 

 .später pract. Arzt in London u. Vorsteher 



einer von ihm zu Biackbeatb gegründeten 

 Anstalt für Rückgrats-Krankheiten. Grün- 

 dendes Mitgl. d. Roy. Institution of Cornwall 

 u. d. Chemical Soc. in London (Ch.S.Wj, 

 geb. 17 89, Apr. 12, London, 



gest. 1850, März 23, 



Er6nder des »Pneumatic Pile-Driving« (Ein- 

 rammen hohler eiserner Röhren u. Schachte 

 mittelst Evacuiren derselben durch Luftpum- 

 pen), welches 1845 auf den Goodwin's Sands 

 zuerst im Grossen ausgeführt wurde. Siehe Po- 

 lytechn. Centralbl. 1 848. — Medicin. Schriften. 



Potyka, Julius Karl. — Dr. Phil. 

 (Göltingen 1859), Apotheker zu Beuthen 

 in Oberschlesien fOrJ, 



geb. 1832, Jan. 6, Beuthen. 

 Über d. .\rsenikkies von Sahla (Pogg. Ann. 

 CVII, 1859). Über d. Boracit von Lüneburg 

 u. d. Stassfurthit von Stassfurth (Ib. id.). Über 

 e. neues niobhaltig. Mineral (Ib. id.). Neues 

 Vorkomm. d. Anorthits im Gestein d. Kon- 

 chekowskoi Kamen (Ib. CVIH, 4 859). Über d. 

 grünen Feldspath von Bodeomais (Ib. id.). 



Poudra, Noel Germinal. — Höhe- 

 rer Stabs-OfEcier in d. französ. Armee, 

 seit 1852 verabschiedet. Prof. an d. £cole 

 d'fitat major. Schüler d. polytecbn. Schule 

 (REP), 



geb. 179 i, . . . 

 Question de probabilitö resolue par la g6om6- 

 trie, 8°, Paris 1 859. Examen critique du Traitö 

 de perspective lin^aire de Mr. de la Ooamerie, 

 80, Ib. 1859. Mit Closflard: Traitö de per- 

 spective-relief, 8°, ib. 1860, 



PoniUet, ClaudeServais Mathias. 

 — Folgweise Schüler (1811), Repetent u. 

 Maitre de Conference de Tficole normale, 

 Prof d. Physik am College Bourbon (Bo- 

 naparte), an d. £cole poiytechnique (einige 

 Jahre; u. an d. Facult^ des Sciences; 18J9 

 Subdirector u. 1831 Director d. Conscr- 

 valoire des Arts-et-Metiers bis 18i9, wo 

 er seine Stellen niederlegte. Mitgl. d. Acad. 

 d. Wiss. in Paris (Or), 



geb. 1790, Febr. 16, Cusanceb. Baume- 

 les-Dames(Doubs).* 

 Elements de physiqueetdem^t^orologie. 2 vol. 

 8"», Paris 1827, 7"«6dit , Ib. 1836 (Deutsch von 

 J. H. Z. Müller). Portefeuille industriel du Con- 

 servatoire des Arts-el-M6tier8 ou Atlas el de- 

 scription des machines etc. ; mit Leblaae, 8", 

 Atlas fol., Ib. 1884. Notions gönörales de phy- 

 sique et de m6t6oroIogie, 12°, Ib. 485«, 3"'* 

 6dit. 1859. — Exp6riences sur les anneaux co- 

 lor(!s qui se forment par la räßexion des rayoos 

 ä la seconde surface des lames öpaiases etc. 

 (Ann. chim pbys. I, 1816, p. 87). M6ra. sur 

 de nouv. phänom^nes de production de cha- 

 leur (Ib. XX, 1 822). Sur les pbönomönes ^lec- 

 tromagnötiques (Ib. XXI, 4 881, p. 77). Sur 



