Spectroscopes. 



170 



2220 



Lockyer, "William J. S. Thoii) 

 gratings and small cameras in eclipse work. 

 Knowledge, London, (X. Ser.), 2, 1905, 

 (117-119). 



Moore, J. H. The loss of light by 

 diffraction at a uaiTow slit. Berkeley, 

 Lick Obs.,Uuiv. Cal. BuU., No.63, [1904], 

 (42-45, with text fig.) ; San Francisco, 

 Cal., Pub. Astr. Soc. Pac, 16, 1904, 

 (203-207) ; Astroph. J., Chicago, 111., 20, 



1904, (285-291, with text fig.). 

 Neuhauss, [Richard]. Spektrograph 



mit parallaktischcr ^lontierung. Phot. 

 Centralbl., HaUe, 10, 1904, (124-125); 

 Phot. Rdsch., HaUe, 18, 1904, (124-125). 

 Newall, H. F. On the general design 

 of spectrographs to be attached to equa- 

 torial of large aperture,' considered chiefly 

 from the ijoint of view of tremor-discs. 

 London, Mon. Not. R. Astr. Soc, 65, 



1905, (608-635). 



Description of a four-prism 



spectrograph attached to the 25-inch nsual 

 refractor (the Xewall telescope) of the 

 Cambridge Observatorv. London, Mon. 

 Not. R. Astr. Soc, 65, 1905, (636-650, 

 with pi.). 



Slipher, Y. I\I. The Lowell spectro- 

 graph. Astroph. J., Chicago, 111., 20, 

 1904, (1-20, with text fig., pL). 



2260 Micrometer for Visual 



Observations. 

 Micrometer for Measuring^ 



Photographic Spectra. 

 Miscellaneous. 



Haschek, Eduard und Kostersitz, Karl. 

 I'eber eiuen "S'ei'such der Ausmessung aou 

 Sternspekti-ogTammen nach der objektiven 

 Methode der Wellenlangenbestimmung. 

 [In : Festschrift L. Boltzmann gewidmet.] 

 Leipzig (J. A. Barth), 1904, (497-500). 



2270 Spectroheliograph and 

 Apparatus for Monochromatic 

 Images. 



Hale, George E[Uery]. The develop- 

 ment of a new method of research. 

 [Address November 23, 1903, University 

 of Chicago Chapter of the Society of Sigma 

 Xi.] Pop. Sci. Mon., New York, N.Y., 

 65, 1904, ([5]-26, with illus.). 



Eempf, P. Der Spekti-oheliograph des 

 Potsdamer Observatoriums. Zs. Instru- 

 mentenk., Berlin, 24, 1904, (317-322). 



Lockyer, "SY[iIliam] J[ames] S[tewart]. 

 The spectroheliograph of the S(Jlar Physics 

 Observatorv. London, Mon. Not. R. 

 Astr. Soc.,"65, 1905, (473-486, with pis.). 



Some results with the Solar 



Physics Observatory photo - spectro - helio- 

 graph. London, Rep. Brit. Ass., 1904, 

 1905, (480). 



The sun in calcium light. 



Knowledge, London (X. Ser.), 2, 1905, 

 (191-193, 215-217). 



Recent spectroheliograph 



results. Xatui-e, London, 72, 1905, (9-13). 



Bicco, Annibale. I modemi studi solan. 

 Catania, Mem. Soc. spetti'oscop. ital., 33, 

 1904, (5-9, con 1 tav.). 



Sauve, A. Spettroelioscopio. Catania, 

 Mem. Soc. spettroscop. ital., 33, 1904, 

 (54-58). 



24C0 PHOTOMETRY, GENERAL. 



Visual. 



Photographic. 



Spectrophotometry. 



Clemens, 11. Rtgistriervorrichhing zum 

 Zlilliicrsclu-u I'hdtometcr. Zs. Instru- 

 iiunttuk., Berlin, 24, 1904, (129-131). 



Lehnert, R. Veber Rauchkeilbeobach- 

 tuu'-eu. Mitt. Yer. Astr., Berlin, 14, 1904, 

 (:]5-40). 



Milne, J. R. Xote on a method of 

 bringing together the two spectra compared 

 in the ordiuarA" spectrophotometer. Edin- 

 burub, Proc. R. Soc, 24, 1904, (496-500). 

 Separate, 1903, (5). 19 cm. 



Pickering, Edward C[harles]. Obser- 

 vations of variable stars made with the 

 meridian photometer during the years 

 1892-1898. Cambridge, Mass., Ann.'Obs. 

 Harvard Coll., 46, 1904, (2 /. +[121]-249, 

 with pi.). Separate. 29cm. 



Trepied, Ch. Sur la constiniction des 

 I'clieUes de gi-andeurs poui- les Cartes a trois 

 poses de 30 minutes. Bulletin du Comite 

 international permanent de la Carte photo - 

 graphique du Ciel, 3, 1903-1904, (82-105). 



2500 RADIOMETRY 

 (BOLOMETRY). 



Abbot, 'C[haries] G[reeley]. The con- 

 struction of a sensitive galvanometer for 

 spectro-boloraetric purposes. Asti'oph. J., 

 Chicago, lU., 18, 1903, (1-20, with text 

 fig)- 



