2040 



]4i; 



Practical Astronomy. 



2040 OBJECTIVES: GLASS AND 

 MANUFACTURE OF GLASS, 

 COMPARISON OF REFLECTORS 

 AND REFRACTORS. 



Optical Matters, Images, Dia- 

 phragms, Screens, Visual Re- 

 fractors. Photographic Refrac- 

 tors. Photographic Doublets. 

 Mirrors. 



Die Theorie tier optischen liistni- 

 r.ieiite. Bearb. v. wis-enschaftHchen 

 Mitarbeitern an der optischea Werkstiitte 

 r. Carl Zeiss. Bd L Die Bilderzeu- 

 pmig in optischen Instrun.enteu votii 

 Standpuakte der geometrischeii Optik. 

 Berlin (J. Springer), 1904, (XXI -f 517j. 

 2'i cm. 18 M. 



Beck, Kourad. Eine nene iletbode 

 der 01)iektivpriifiing. Jahrb. Phot., 

 Ualle, 17, 1903, (257-274). 



Cliesire, Frederic J. Ueber die 

 HeUigkeit des Gesichtsleldes bei Pris- 

 nien- Doppelfernrohren. [Uebersetziing.] 

 Jlethaniker, Berlin, 11, 1903, (277-280). 

 Conrady, A. E. On the chromatic 

 correction of object glasses. Second 

 Paper. London, Mon. Not. R. Astr. 

 Soc, 64, 1904, (458-4(30). 

 . Culmann, P. et alii. Die Bilderzeu- 

 ginig in optischen Instrunienten voni 

 Standpunkte der geometrischen Optik. 

 Hrsg. V. M. V. Rohr. (Die Theorie der 

 optischen Instrumeute. Bearb. v. ilitarb. 

 a. d. opt. Werkstatte v. C. Zeiss. Bd 1.) 

 Pprliu (J. Springer), 1904, (XXI -f 587). 

 25 cm. 18 M. 



Draper, Heniy. On the construction 

 of a silvered glass telescope fifteen and 

 n half inches in aperture, and its u^e in 

 .-olestial photography. [Reprinted from 

 W.-ishington, D.C., "Smithsonian Inst., 

 Cont. Know!., 14, 1864.] Washington, 

 D.C, Smithsonian Inst. Cont. Knowl., 

 34. No. 1459, 1904, (2 1. + [iv] -f 55, 

 with text fig.). 



Eberliard, G. Ueber den schadlichen 

 Eintluss des Verkittens von 01).iektiven. 

 Zs. Instrumentenk., Berlin, 23, 1903, 

 (274-277). 



Franz, Julius. Ueber zwei nene 

 grosse Meridiau-lusirumente nnd iilier 

 ein neues photographisches Objectiv der 

 Breslauer Sternwarte. Breslau, Jahres- 

 ber. Ges. vaterl. Cultnr, natw. Sect., 79 

 (1901), 1902, (2-5). 



Hartmann, .1. Optische Bank [fiii 

 Objektivunterauchung]. Jahrb. Phot.- 

 Halle, 17, 1903, (665-674). 



Lehmann, H. Optische Untersuchun- 

 gen Fernrohr-ObjectiveJ. Zs. Instru- 

 mentenk., Berlin, 23, 1903, (289-301). 



Pocklin^on, H. C[abouru]. Grinding 

 ami iiulishing of glass specula. Leeds. 

 J. Astr. Sue, 11, [1903], (22-27). 



Ritchey, George W. On the moderri 

 reflecting telescope and the making and 

 testing of optical mirrors. Washington, 

 D.C, Smithsonian Inst., Cont. Knowl.. 

 34, No. 1459, 1904, (vi + 51, with text 

 fig. and pi.). 



Schaer, E. Une modification di re- 

 flecteur Newtonien. Astr. Nach., Kiel,. 

 165, 1904, (345-348). 



Strehl, Kail. Theorie des Ableseob- 

 joktives. Zs. Instrumentenk., Berlin. 

 23, 1903, (305). 



Taylor, H. Dennis. " Photographit- 

 chart "... (r. Franklin-Adams). 

 Description of the lenses. London. 

 Mon. Not. R. Astr. Soc, 64, 1904, (613- 

 624). 



Turner, H. H. Note on a possible 

 source of error in measures of star places 

 due to defective centring of the object- 

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

 65. 1905, (54-55). 



■ Further note on the origin 



of magnitude-equation in photographic 

 measures. London, Mon. Not. R. Astr. 

 Soc, 65, 1905, (228-229). 



Wadsworth, F[rankJ L[awton] O[lcott]. 

 Some notes on the correction and testing 

 of parabolic mirrors. [Reprint from 

 Pop. Astr., Northfield, Minn., 10, 1902, 

 (337-348)] ; Allegheny, Pa., Sc. Paprs. 

 Obs., (N. Ser.), No. 8, [1902], (12, with 

 text fig.). 23 3 cm. 



Wake, H. Large v. small telescopes 

 on planets. Knowledge, London, (N. 

 Ser.), 1, 1904, (40). 



2050 EQUATORIAL MO UNTING.S 

 (DESCRIPTION, Etc.) AND 

 DRIVING CLOCKS. 



Abbot, C. G. The new ccslostat and 

 horizontal telescope of the astrophysical 

 observatory of the Smhhsonian institu- 

 tion. Washington, D.C, Smithsonian 



