Objectives. 



2040 



Objektiven. Centralztg Opt., Berliu, 25, 



1904, (265). 



Strehl, Karl. Zoucn uud Leistung der 

 lletraktoren. Zs. Instrumeutenk., Berlin, 

 24, I'JOi, (.322-326). 



2050 EQUATORIAL MOUNTINGS 

 (DESCRIPTION, Etc.) AND 

 DRIVING CLOCKS. 



Caron, G. Petit equatorial photogra- 

 phicjue d'amateur. Paris, Bui. Soc. astr. 

 France, 1903, (.^O.^-SO?). 



Etzold, R. Ueber Verbesserungeu an 

 astrouomischeulnstrumenten. D. MechZtg, 

 Berlin, 1904, (.53-5.5, 61-64, 93-97). 



Gilliban, AUeu F. The photographic 

 (■quabirial of the students' observatory. 

 San l<'r;in{'isco, Cal., Pub. Astr. Soc. Pac, 

 16, 1904, (89-93). 



Grubb, Howard. A modified form of 

 electrical control for driving clocks. 

 Dublin, Sci. Proc. R. Soc. (N. Ser.), 11, 



1905, (34-36). 



A new form of right- 

 ascension slow motion for equatorial tele- 

 scopes illustrated by the driving-gear of the 

 Cape Town E([uatorial. Dublin, Sci. 

 Proc. R. Soc, (N. Ser.), 11, 1906, 

 (37-38, with pi.). 



Moye, M. Monture equatoriale d'ama- 

 teur. Paris, Bui. Soc. astr. France, 1903, 

 (187-191). 



Neuhauss, [Richard]. Spektrograph 

 mit parallaktischer Montierung. Phot. 

 Centralhl., Hallo, 10, 1904, (124-125) ; 

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



Pickering, Edward C[harles]. The 

 24-inch reflecting telescope. Astr. Nachr., 

 Kiel, 168, 1905, (147-150). 



Plummer, II[enry] C. Notes on the 

 coclostat and siderostat. London, Mon. 

 Not. R. Astr. Soc, 65, 1905, (487-501). 



Porter, J. G. The new sixteen-inch 

 telescope of the Cincinnati Observatory. 

 Pop. Astr., Northfield, Minn., 12, 1904, 

 ([437]-439, withpl.). 



See, T. J. J., assisted by Lawton, 

 George K. Observations of Eros with the 

 26-inch equatorial, 1900-1901. Wash- 

 ington, D.C., Pub. U.S. Naval Obs., 

 (Ser. 2), 3, 1903, (A .xxi -f A 73). 



Wirtz, 0[arl] W. Kritische Bemer- 

 kungeu iiber neuere Methoden der Ent- 

 iernungsbestimmung der Fixsterne. Natw. 

 Rdsch., Braunschweig, 19, 1904, (105- 

 107). 



2070 MERIDIAN INSTRUMENTS 

 (MOUNTING AND DESCRIP- 

 TION). 



Transit Circle, Visual and Photo- 

 graphic Zenith Telescope, 

 Visual and Photographic. 



Eichelberger, "NV. S., assisted by 

 Lawton, George K. and Hammond, 

 John C. Observations of 495 zochacal 

 stars with the 9-inch transit cu-cle, 1900. 

 Washington, D.C., Pub. U.S. Naval Obs., 

 (Ser. 2), 3, 1903, (Cix+C47). 



Etzold, R. Ueber Verbesserungen an 

 astrouomischen Instrumenten. D . MechZtg, 

 BerKn, 1904, (53-55, 61-64, 93-97). 



King, Theo I. , assisted by Boeger, E. A. , 

 Brown, W. M. and Hammond, J. C. 

 01)serAations of Eros and reference stai"s 

 Avith the 9-inch transit circle. 1900-1901, 

 Washington, D.C., Pub. U.S. Naval Obs., 

 (Ser. 2), 3, 1903, (BxA-i + B69). 



Schwarzschild, K[arl]. L^eber Breiteu- 

 bestinimung mit Ililfe einer hiingenden 

 Zenitkamera. Astr. Nachr., Kiel, 164, 

 1904, (177-182). 



Tucker, R. H. The gi-aduation eiTors 

 of a divided circle. Pop. Astr., Northfield, 

 Minn., 11, 1903, ([523]-534). 



The ultimate measurement 



of graduation eiTors. Pop. Astr., North- 

 field, Minn., 12, 1904, (579-585). 



TJpdegraflF, Milton, assisted by Littell, 

 Frank B. and lawton, George K. 

 Observations Avith the 6-inch transit circle. 

 1900-1901. AVashington, D.C., Pub. U.S. 

 Naval Obs., (Ser. 2), 3, 1903, (D Ixxv -l- 

 D 107, with pi.). 



2080 EXTRA - MERIDIAN IN- 

 STRUMENTS FOR ABSOLUTE 



POSITION. 



Altazimuth. 

 Vertical Circle. 

 Almucautar. 

 Various. 



Archenhold, F. S. Der Darmersche 

 Libellen - Spieuel - Quadi-aut. Weltall, 

 Berliu, 4, 1904, (297-302). 



Cooke, W. E. On a new very accui-ate 

 method of obtaining time, latitude, and 

 azimuth for field work. Pop. Astr., 

 Northfield, Minn., 11, 1903, ([169]-179). 



