PASTEUR: On the Spectrum of the Phosphorescent Light emitted by certain. He found that the light from a Mexican Pyrophorus gave a continuous spectrum. PICKERING: Comparative Efficiency of different Forms of Spectroscopes. Silliman's Journal, May 1868. PISANI : On Pollux, a Silicate of Casium. Compt. Rend. lviii. 714. PLÜCKER: On the Measurements of the Wave-lengths of the Metallic Lines. PLÜCKER & HITTORF: On the Spectra of Ignited Gases and Vapours, with especial regard to the different Spectra of the same Elementary Gaseous Substance. Phil. Trans. 1865, P. 1. These important experiments show that by varying the physical conditions certain of the elementary bodies yield two distinct spectra. Plücker explains this by the assumption of several allotropic conditions of the element existing at various temperatures. ROBINSON, DR. : On Electric Spectra. Phil. Trans. 1863. ROOD, O. N.: On the Didymium Absorption Spectrum. Silliman's Journal, Second ROSCOE, H. E.: On the Spectrum produced by the Flame evolved in the Manufacture of Steel by the Bessemer Process. Proc. Lit. Phil. Soc. Manchester, Feb. 24, 1863; Phil. Mag. Fourth Series, xxv. 318; Journ. Iron and Steel Institute, vol. ii. p. 38. ROSCOE & CLIFTON : On the Effect of Increased Temperature upon the Nature of the Light emitted by the Vapour of certain Metals or Metallic Compounds. Chemical News, v. 233 (1862). the position of these lines, and he first explained the delicacy of the Sodium reaction, and first described the use of a collimator for spectroscopic research, rendering the rays thus parallel as if the slit were placed at an infinite distance (1856). TALBOT, H. Fox: Some Experiments on Coloured Flames. Science, v. 1826. Brewster's Journal of On a Method of obtaining Homogeneous Light of Great Intensity. On the Flame of Lithia. Phil. Mag. Third Series, 1834, iv. 11. THALÉN, R.: On the Determination of the Wave-lengths of the Lines of the Taking as his starting-point the determination of wave-lengths of the principal Fraunhofer's Lines by Ångström (Recherches sur le Spectre Solaire, par A. J. Ångström. I.-Spectre Normal du Soleil. Upsal, 1868), the author, by graphical interpolation, obtains, from Kirchhoff's and Angström's Tables, the wave-lengths of the bright metallic lines. A large Plate accompanies the Memoir, giving the lines and their wave-lengths of forty-five metals. The following twenty-three were examined in the metallic state :-K, Na, Mg, Al, Fe, Co, Ni, Zn, Cd, Pb, Tl, Bi, Cu, Hg, Ag, Au, Sn, Pt, Pd, Os, Sb, Te, In. The remaining twenty-two were examined as chlorides : Li, Cs, Rb, Ba, Sr, Ca, Gl, Zr, Er, Y, Th, Mn, Cr, Ce, D, L, U, Ti, Wo, Mo, V, As. TYNDALL & FRANKLAND: On the Blue Band of the Lithium Spectrum. Phil. Mag. Fourth VAN DER WILLIGEN: On the Spark of the Induction Coil. VIERORDT, K.: Pogg. Ann. cvi. 615. Die Anwendung des Spectral Apparates zur Vergleichung und WALTENHOFEN, A. VON: Spectra of Electric Spark in rarefied Gases. Dingl. Pol. J. clxxvii. 38. WATTS, W. M.: On the Spectrum of the Bessemer Flame. Phil. Mag. Fourth On the Spectra of Carbon. Phil. Mag. Fourth Series, xxxviii. 249. On the Spectrum of the Bessemer-flame. Phil. Mag. vol. 45, p. 81. WHEATSTONE, C.: On the Prismatic Decomposition of the Electric, Voltaic, and Electromagnetic Sparks. Read August 12, 1835. British Assoc. Dublin. Chemical News, iii. 198. WÜLLNER : On the Spectra of the Gases under different Pressures. Phil. Mag. YOUNG, C. A.: Spectroscopic Notes. Journ. Franklin Institute. III. MEMOIRS RELATING TO THE APPLICATION OF SPECTRUM ANALYSIS TO CELESTIAL CHEMISTRY. AIRY, G. B., Astronomer Royal : Measurements of Stellar Lines. Monthly Notices of the Roy. Astron. Wave-lengths of Lines in Kirchhoff's Maps. Phil. Trans. 1868, ÅNGSTRÖM, A. J. : Wave-length Measurements. Aus Oefversigt af K. Vetensk. Acad. On the Fraunhofer Lines visible in the Solar Spectrum, and on the Optical Researches. Vetensk. Acad. February 1853. Phil. Mag. The nature of the Electric Spectrum pointed out. |
