Practical Astronomy. 



140 



270 



Fennel, Adolf. Ueber einige Vcr- 

 besserungen an Schrauben-Mikroskoi> 

 Theodoliten. Zs. Veniiersgsw., Stutt- 

 gart, 32, 1903, (574-578). 



Loschner, }[. Eiiie neue Mikrometer- 

 scliraiibe fiir Kreisbewegung. D. Mech- 

 Zfg, Berlin, 1903, (165-i66j. 



Oertel, K. Ueber das Repsold'sclie 

 unpersunliche lieglstriermikrompter, 

 nebst den mit demselben am Meridian- 

 kreis der Miinchener Sternwarte Ijeo- 

 baehtcten Rektaszensiouen von •^08 

 Fundamentalsternen. Astr. Xacbr., Kiel, 

 165, 11104, (81-08;. 



Rheden, Joseph. Der Stereokom- 

 parator und seine Bedeutung fiir die 

 nioderne Messknnst. Jakrb. Phot., 

 Halle, 17, 1903, (120-12GJ. 



Smith, Edwin. The determination of 

 the mean value of a micrometer s -rew. 

 Washington, D.C, U. S. Treas. Dept. 

 Coast Geod. Surv., Rep. 1900, 1901, 

 (701-712;. 



2200 



SPECTROSCOPIC 

 APPARATUS. 



Langley, Samuel Pierpont. Report of 

 the Secretary of the Smithsonian Insti- 

 tution of all appropriations heretofore 

 expended by the Astrophysieal Observa- 

 tory, results reached, and present con- 

 dition of the work, in response to Senate 

 resolution of February 25, 1901. [I'lib- 

 lished as Senate l-ocument No. 20, 57th 

 Congress, 1st Session.] Washington, 

 D.C, 1902, (xxxiii + 306, with pi.). 

 20.5 cm. [Includes reprint of Annals 

 of the Smithsonian Astrophysieal Ob- 

 servatory, Vol. 1.] 



Lummer, O[tto] und Gelircke, E[rnst]. 

 Theorle imd Leistungsfiihigkeit der 

 Dispersionsappanite hoher AuHosungs- 

 kraft. B.^rlin, Wiss. Abh. jjhvsik. 

 Reichsanst., 4, 1904, (Gl-8i). 



Wadsworth, Ffrank] L[awlon] 0[lcott]. 

 Tlif th(V)ry of the ocular spectroscope. 

 [Willi hiljliogniphv.] Allegheny, Pa., 

 Sfi. Paprs. Obs., (X. Ser.), No. 6,"[1902], 

 ;I0). 2i3cm. 



Description of a new type 



of foail plane spectroscope and its ap- 

 plication to astronomical spcctroscojiy. 

 [With bibliography.] AHcghenv, Pa., 

 Sci. Paprs. Obs.. (N. Ser.), No. 7, [1902], 

 (15, with pi.). 23 cm. 



Wood, irobert] W[illianis]. On screen- 

 transparent only to ultraviolet light and 

 their use in spectrum photographv. 

 Astroph. J., Chicago, 111., 17, 1003, 

 (133-140, with pi.). 



2210 



Objective Prism. 

 Objective Grating. 



King, A. S. Note on some effects of 

 ruling errors in grating spectra. As- 

 troph. J., Chicago,'lll., 17, 1003, (239- 

 242, with pi.). 



Rollins, William. On ruling concave 

 gratings. Amer. J. Sci., New Haven. 

 Conn.rfSer. 4), 15, 1903, (40-53). 



2220 Solar Spectroscopes and 

 Spectrographs with Slits. 



Eclipse Spectroscopes and 

 Spectrographs. 



Stellar Spectroscopes and 

 Spectrographs. 



Spectroscopes and Spec- 

 trographs for Study of 

 Mebulge. 



Ocular Spsctroscopes. 



Larkin, Ivlgar L. The new spectro- 

 graph at the Lowe Observators". Lo?. 

 Angeles, Bull., So. Cal. Acad. "Sci., 1, 

 1002, ([23]-24, with text fig. and pi.). 



Palmer, Harold King. An application 

 of the Crossley reflector of the Lick 

 observatory to the stud\' of very faint 

 spectra. 1 r)'s5. University of California.! 

 Berkeley, Lick Obs., Univ. C;;l., Bull ,' 

 No. 35,'[1002], (4G-54). 



2270 Spectrohehograph and 

 Apparatus for Monochromatic 

 Images. 



Evershed, J. The liumford sj oclr..- 

 heliograph of the Vei kes Observatory. 

 Observatory, London, 27, 1001, (104- 



107). 



Hale, George E. and EUerman, Ferdi- 

 nand. The Rumford siiectroheliograph 

 of the Yerkes (.tbservatory. Chicago. 

 111., Pub. Yerkes Obs. Univ. Chic, 3. 



1003, 



il, ,1 



