173 



2120 



Nyren, M. Ueber den moderueii 

 licpsohrschen Meridiankreis. Astr. 

 Xachr., Kiel, 154, 1901, (305-310). 



Benierkuiigen zu Dr. 



Reps old's Aiifsitz in A.X. 3fil)8. 

 Astr. Nachr., Kiel, 155, 190l, (201- 

 206). 



Repsold, J. Ueber den Meridiankreis 

 der Strassburn; Sternwarte, Astr. 



Nadir., Kiel, 154, 1901, (187-190). 



Ueber den Meridiankreis 



der Strasslmrtrer Sternwarte. Astr. 

 Nachr. Kiel, 154 1901, (435-436). 



Searle, Arthur. . . . Results 

 obtained with different forms of 

 apparatus in meridian observations. 

 Cambridge, Mass., Ann. Obs. Harvard 

 Univ., 41, [1901], (189-211). 



2080 EXTRA - ilERIDlAX IN- 

 STRUMENTS EOR ABSOLUT!-: 

 POSITION. 



Altazimuth. 

 Vertical Ciixle. 

 Almucantar. 

 Various. 



Dolezal, E[duard]. E. G r e v e ' > 



Phototheodolit. Mechaniker, Berlin, 9. 

 1901, (181-184). [J 87J. 



2100 AUXILIARY INSTIM- 



MEXTS. 



Clocks. Chronometers, Watches, 



Chronographs. 

 Levels. 



Cliristie, W[illiam] H[envy] iI[ahoney]. 

 Rates of chronometers on trial for 

 purchase by the Board of Admiralty at 

 the Royal Observatory, Greenwich, 

 from 1899 July 1, to 1900 January 20. 

 Greenwich Obsns., 1899, 1901, (1-13). 



Rates of deck watches on 



trial for purchase by the Board of 

 Admiralty, at the Roj'al Observatory, 

 Greenwich, from 1899 October 21, to 

 1900 February 10. Greenwich Obsns., 

 1899, 1901, (i-7). 



Etzold, R. Messung kleiner Zeittheilo. 

 D. MechanikcrZtg, Berlin, 1902, (l-3j. 

 [B 0150]. 



Gruey, L. .J. Douzieme bulletin 

 chrononietrique de I'Observatoire de 

 Besan(,-on. Anneel900. Besangon, 1901, 

 (20), 31 cm. 



Treizieme bidletin ckrono- 



metrique de I'Observatoire de Besanq-on. 

 Aimee 1901. Besan?on, 1901, (20), 

 31 cm. 



Guillaume, Ch. Ed. Precede pratique 

 pour la correction de I'erreur secojidaire 

 des chronometres. Paris, C.-R. Acad, 

 sci., 132, 1901, (1105-1107). 



Reverchon, L. Un progres en chrono- 

 metrie. Xature, Paris, 29, (13 semest.) 

 1901, (147, av. fig.). 



Schroeder, Hugo. Ueber die Herstel- 

 lunc: der Xiveau's. Centralztg Opt., 

 Berlin, 22, 1901, (61-62, 73-74). 



Ungerer. Ueber einige Getriebe an 

 der Uhr des Strassburger Ministers, 

 insbesondere die Darstellung des schein- 

 baren Laufes von Sonne und Mond. 

 Vortrao-. Berlin, Zs. Yer. D. Ing, 45, 

 1901, (17.54-1755). [9200]. 



2120 EYEPIECES AXD ACCES- 

 SORIES. 



Eyepieces, Illumination. Screens, 

 Solar Eyepieces, etc. 



Enlarging Lenses, Correcting 

 Lenses, etc. 



Photographic Plate Holders, Ex- 

 posing Shutters, etc. 



Halle, Gustav. Einiges iiber Sonnen- 

 lilendungen. Weltall, Berlin, 1, 190l, 

 (1.38-139). 



Lippmann, G. Sur mi appareil 



dt>tinc a eiitrainer la jilaque photo- 

 gra|ilii(iue qui re<^oit I'image fonrnie par 

 un siderostat. J. Plivs., Paris, (Ser. 3), 

 10, 1901, (415-417, av. fig.). 



Todd, David P. On a modified form 

 of revolving occulter for adapting the 

 exijosurc of the sun's corona to its 

 actinic intensity at all distances from 

 the moon's limb. London, Men. Not. 

 R. Astr. Soc. 61, 1901, (531-533 with 

 ])1.). (Reprint), Engl. Mech., London, 

 74, 1902, (6-7). 



Note on the Siugkep 



comnuitator. London, Rep. Brit. Ass., 

 1901, (541-542). 



The Singkep mechanical 



commutator. London, J. Brit. Astr. 

 Ass., 12, 1902, (169-175). 



