Instruments- 



139 



2050 



Pliunmer. 13081. A year among 

 American astronomers. 



Townley. Interuational latitude ob- 

 servatory, Ukiah, Cal. A.S.P., 17, (71). 



2020 OBSERVATORY BUILDINGS. 



Foerster. 12931. Einfliisse der 

 Temperatur auf die Bewegungeu der 

 die astronomischen Instrumeute tragen- 

 den Pfeiler. 



HaJe. The spectroscopic laboratory 

 of the solar observatory. A.J., 24, (61). 



Metcalf. An amateur's observatorv. 

 P. A., 14.^211). 



Roe, jun. Effect of wind forces on an 

 observatory dome. P. A., 14, (347). 



Schorr. 13S27. Ban uud Einrich- 

 tung der neuen Hamburger Sternwarte. 



2030 IXSTRL'MEXTS (GENERAL). 

 Old Instruments, Astrolabes, etc. 



Antoniadi. 12419. Size of Ulugh 

 Beigh's quadrant. 



Mee. 13421. The earliest telescope 

 in Euglaud. 



Mezzetti. 13414. I grandi telescopi 

 moderni. 



Repsold. 1374.5. Zur Geschichte der 

 astronomischen Mess\> erkzeuge von 

 Purbach bis Reicheubach 1450 bis 1830. 



Szakall. 13922. Geschiclite der Er- 

 findung des Ferurohres. (Ungar.) 



2040 OBJECTIVES rLENSES, 

 MIRRORS) : CALCULATION, 

 PRACTICAL WORK, EXAMINA- 

 TION OF SCRFACES, MOUNT- 

 ING IN TUBE, OPTICAL 

 SUBSTANCES, GLASS AND 

 MANLFACTU'RE OF GLASS, 

 COMPARLSON OF REFLEC- 

 TORS AND REFRACTORS. 



Optical Matters. Images, Dia- 

 phragms. Screens, Visual 

 Refractors. Photographic 



Refractors Photographic 



Doublets. Mirrors. 

 Belopoliskij . 12503. Eine Eigen- 



tiimliclikeit des Objectivs des 30-zolligen 



Refractors. 



Curtis. Temi:)erature control for 

 silvered specula. A.J., 26, (250). 



Gifford. An imjn-o\ed triple object- 

 glass. M.N., 69, (118). 



Grubb. 13023. New form of divided 

 object-glass telescope. 



13024. The reflecting 



telescope and its suitability for physical 

 research. 



Hale, G. E. A 100-inch mirror for 

 the solar observatory. A. J., 24, (214) ; 

 P.A., 14, (557). 



Hoyt. 13130. Use and care of re- 

 ilecting telescopes. 



Kostinskij. 13239. Le refracteur 

 photonraiihique Bredichin a court foyer 

 apparlenant a I'observatoire de Poul- 

 kovo. (Russ.) 



Lomb. Theory of cemented doublets. 

 A.J., 24, (203). 



Plassmaim. 13073. Abhiinglgkeit 

 der Lichtschatzungen vom Fernrolir. 



Rayleigh, Lord. 13735. On the 

 aljerration of sloped lenses and on their 

 adaptation to telescopes of unequal 

 magnifying power in perpendicular 

 directions. 



Ricco. 13700. Quelques particu- 

 larites optiques de I'objectif photo- 

 graphique de I'observatoire de Catane. 



Schaer. 13810. Nouvel objectif 

 astrophotograpliique a tres court foyer. 



Stoney, G. J. 13900. Telescopic 

 vision. 



Turner. Relative numbers of star 

 images photographed in different parts 

 of the plates for the Oxford portion of 

 the Astrographic Catalogue. il.N., 68, 

 (397). 



WMttaker, E. T. 14031. The theory 

 of optical instalments. [No. 7 of Cam- 

 bridge tracts in Mathematics and Mathe- 

 matical Physics.] 



2050 EQU.\TORIAL MOUNTINGS 

 (DESCRIPTION, Etc.) AND 

 DRIVING CLOCKS. 



Mounting the sixty-inch reflecting 

 telescope at Harvard college observa- 

 tory. [Reprinted from Chicago Record- 

 Herald, Jan. 14, 1906.] P.A., 14, (142). 



Hale. Tests of the Snow telescope. 

 [Solar Observatory, Alt. Wilson, Cal.] 

 A.S.P., 17, (lOOj. 



A vertical coelostat tele- 

 scope. A.J., 25, (68). 



