LITERATURE OF THE SPECTROSCOPE. 31 



RIGID SPECTROSCOPES. 



Description of a rigid spectroscope ; constructed to ascertain whether the 

 position of the known and Avell-defined lines of a spectrum is con- 

 stant while the coefficient of terrestrial gravity uuder which the 

 observations are taken is made to vary. 

 Gassiot (J. P.). Proc. Royal Soc, 14, 320. 



On the observations made with a rigid spectroscope by Captain Mayne 

 and Mr. Connor. 



Gassiot (J. P.). Proc. Royal Soc, 16, G. 



ROTARY SPECTROSCOPE. 



Ueber einen rotirenden Spectralapparat. 



Lohse (0.). Z. Instrumentenkunde, 1, 22-25; Beibliitter, 5, 278. 



SCALES. 

 (See "Measuring Apparatus.") 



SCREENS. 



Die Beugungserscheinungen geradlinig begrenzter Schirme. 



Lommel (E.). Abhandl. d. bayr. Akad., (2) 15, 529-664, 1886; Bei- 

 bliitter, 11 (1887), 42-46 (Abs.). 



APPARATUS FOR SECONDARY SPECTRA. 



On a secondary spectrum of very large size, with a construction for sec- 

 ondary spectra. 



Rood (0. N.). Amer. Jour. Sci., (3) 6, 172-180. 



Du spectre secondaire et de son influence sur la vision dans les instru- 

 ments d'optique. 



Poucault (Leon). Ann. Chim. et Phys., (5) 15, 283. 



SELENACTINOMETER. 



Un Selenactinometre. 



Morize (H.). Comptes Rendus, 100, 271-272; Beibliitter, 9, 256. 



SLITS FOR SPECTROSCOPES. 



Sur un spectroscope a fente inclinee. 



Garbe (G.). Comptes Rendus, 96, 836 ; Jour, de Phys., 12 (1883), 318. 



