2040 



Wolf, M[ax]. Die Kiitdec-kiui.c; iiiui 

 Katalogisiriing von kleineren Kebcl- 

 fleckeix durcli die Photographie. Miiii- 

 clien, SitzBer. Ak. Wiss., math.-pliys. 

 CI., 1901. (111-12G). [7800 2140 

 3240]. 



2050 EQUATORIAL MOUNT- 



INGS (DESCRIPTION, Etc.) 

 AND DRIVING CLOCKS. 



Visual Refractors, Photographic 

 Refractors. 



Photographic Doublets (Portrait 

 Lenses). 



Mirrors. 



Heliometer. 



Heliostats, Coelostats. 



Driving Clocks, Control Pendu- 

 lums, etc. 



Comu, A. Snr la compensation nic- 

 caniqiie de la rotation du champ opticpie 

 fourni jrar le siderostat et I'lieliostat. 

 Paris, C.-R. Acad, sci., 132, 1901, 

 (1013-1017). 



Etzold, R. Richtige Aufstellung von 

 Aeqiiatorealen. Zs. Instriunentenk., 

 Berlin. Beibl. : D. MecliauZtg, 1901, 

 (153-155). 



Richtige Anfstellung von 



Aecpiatorealen. (Fortsetznug.) Zs. 

 Instrumentenk., Berlin, 21, 1901, Bei- 

 blatt: Deutsche Mechaniker-Zeitung, 

 (173-170, 181-183). 



Grigg, Jolni. Photography with a 

 small telescope. London, 'j. Brit. 

 Astr. Ass., 12, 1902, (125-120). 



Hartmann, J. Ueter die Correction 

 eines jieriodischenFehlers in der Beweg- 

 nng des Potsdanier 80 cm-Refractors. 

 Astr. Naclrr., Kiel, 158, 1902, (1-14, 

 mit 1 Taf.). [3220J. 



Kostersitz, Karl. Meteorograph fur 

 veriinderliche Polhohe mit grossem Bild- 

 feld und voll^tandig freier Visur. Astr. 

 Nachr., Kiel, 156, 1901, (97-102). 

 [0650]. 



Lippmann, G. Sur un ajipareil des- 

 tine a entrahier la plaque jliotograj-iliique 

 ([ui re^oit I'image fouruie par un sidero- 

 stat. Paris, C.-R. Acad, sci., 132, 1901, 

 (931-932). 



Plummer, H[enry] C. A method of 

 mechanically comijeusating the rotation 

 of the iield of a siderostat. London, 

 Mon. Not. R. Astr. Soc, 61, 1901, (401- 



407). 



Note on the geometry of 



tlie siderostat. London, Mon. Net. R. 

 Astr. Soc, 61, 1901, (459-4C2). 



Reyval, J. Horloge electrique. 



Eclair, electr., Paris, 26, 1901, (24.5- 

 250, av. pi.). 



Kitchey, G. W. The Two-foot reflect- 

 ing telescope of the Yerkes Oljservatory. 

 Chicago, 111. Astroph. J. Univ. Chic, 

 14, 1901, (217-233, with pi.). [2040]. 



Turner, H[erbert] H[all]. On mechani- 

 cally compensating the rotation of the 

 field of a siderostat. London, iloiu 

 Not. R. Astr. Soc, 61, 1901, (122-129). 



2070 MERIDIAN INSTRUMENTS 

 (MOUNTING AND DESCRIP- 

 TION). 



Transit Circle, Visual and Photo- 

 graphic. 



Zenith Telescope. Visual and 

 Photographic. 



Cookson, Bryan. Description of a 

 floating photographic zenith telescope 

 and some preliminary results obtaineci 

 with it. London, Mon. Not. R. Astr. 

 Soc, 61, 1901 (315-334, with pL); also 

 Engl. Mech., London, 73, 1901, (222- 

 224). 



Comu, A. Sur un appareil zenitho- 

 nadiral destine a la mesure des distances- 

 zenithales d'etoiles voisines du zenith. 

 Bui. astr., Paris, 18, 1901, (372-389). 



Fennel, Adolf. Kleines Durchgangs- 

 instrumeut. Zs. Instrimientenk., Berlin, 

 21, 1901, (326-328). 



Gautier. Experience faite sur le 

 cercle meridien du jardin de I'Obser- 

 vatoire de Paris. Eul. astr., Paris, 18, 

 190J, (217-218). 



Lippmann, G. Mire meridienne a 

 miroir cvlindrique. Paris, C.-R. Acad, 

 sci., 132^ 1901,(507-510). 



Mire meridienne a miroir 



cvlindrique. J. phj's., Paris, (ser. 3), 

 10, 1901, (413-415). 



