Spectroscopes. 



142 



2200 



de chaciin des deux elements. C.R., 

 145, ( 1 108;. 



Hamy. Un mecanisme permettaut de 

 mamtenir un train de prismes rigou- 

 reusement an nainimum de deviation. 

 C.R., 145, (53). 



Spectroscopes a miroirs. 



C.R., 145, (590). 



Reese. An occulting shutter for con- 

 cave grating spectroscopes. A.J., 24, 

 (49). 



Watts. 14008. Some novel methods 

 in spectrum analysis. 



2210 Objective Prism. 

 Objective Grating. 



Giesing. Investigations on jilane re- 

 flection gratings with reference to their 

 use in the absolute determination of 

 wave-lengths. [Abstract.] A.J.,25, (237;. 



Salet. La combiuaison du prisme- 

 objectif et du spectrographs enregis- 

 treur. B.A., 25, (135;. 



Schaer. 13817. Le prisme objectif 

 employe pour I'etude du spectre solaire. 



2220 Spectroscopes and Spectro- 

 graphs Solar Eclipse, Stellar, 

 and for Study of Nebulae. 

 Ocular Spectroscopes. 



Belopolisky. Eine Eigentiimlichkeit 

 des Objectivsdes30-zolligen Refractors. 

 M.S.Pii., 2, (1^9). 



Buss. 12G30. Solar obsen-ations 

 Avith small instruments. 



Hamy. Les spectroscoj^es a miroirs. 

 B.A., 25, (27). 



Parr. 13595. Stellar spectroscopy 

 with a 3-in. telescope. 



Scbaer. 13817. Le prisme objectif 

 employe pour I'etude du spectre solaire. 



Watts. 14010. New form of spectro- 

 scojje. 



2240 PRISII COMBINATIONS 

 WITH DEVIATION. PRISM 

 COMBINATIONS WITH DIRECT 

 VISION SLIT. 



Abetti. SuU'apparato a due prismi 

 di rifiessione che da I'innnagine di un 

 oggetto completamente rovesciata. S.S.I., 

 36, (203). 



Konkoly Tliege. 13224. Eiu neues 

 Passage-Prisma. (Ungarisch.) 



2250 AUXILIARY APPARATUS. 

 PRODUCTION OF COMPARISON 

 SPECTRA. CORRECTING LENS 

 FOR SPECTROSCOPIC OBSER- 

 VATIONS. 



Hartmann. The spectrocomparator. 

 A..J., 24, i2S.5). 



2260 MICROMETER FOR 



VISUAL OBSERVATIONS. 



MICROMETER FOR MEA- 

 SURING PHOTOGRAPHIC 

 SPECTRA. MISCELLANEOLTS. 



Wolfer. 14079. Messapparat fiir 

 photographische Platten von 0. Toepfer 

 u. Sohn. 



2270 Spectroheliograph and 

 Apparatus for Monochromatic 

 Images. 



Millochau & Stefanik. New form 

 of spectroheliograph. A. J., 24, (42). 



2300 POLARIZATION 



APPARATUS. 



Biske. " Le contrasts " dans I'ob- 

 servation a I'aide d'une lunette muuie 

 d'un polariscope. S.S.I., 36, (34). 



2400 PHOTOMETRY, GENERAL. 



Visual. Photographic. Spectro- 

 photometry. 



Bemporad. Osservazinni fotometriche 

 eseguite nel triennio 1904-1906 nel- 

 I'osservatorio astrofisico di Catania. 

 S.S.I., 36, (89). 



Bergstrand. Abhangigkeit der atmo- 

 sphiirischen Dispersionswirkungen von 

 den Sterngrossen. A.N., 177, (241). 



Maddrill. Investigation of the Rum- 

 ford photometer of the Lick observatory. 

 A.S.P., 17, (121 ). 



2500 RADIO.METRY 



(BOLOMETRY). 



Abbot. 12358. Observation of the 

 total solar eclipse of January 3, 1908: 

 A bolonietric study of the solar corona. 



Turner. 13985. Relation between 

 intensity of light, time of e.xposure and 

 l)liotographic action. (Rep. Brit. Ass., 

 1908.) 



