Practical Astronomy. 



3020 



TRANSIT CIRCLE. 



Rambaut, Arthur A. On a very 

 -sensitive method of determining the 

 irregularities of a pivot ; on the pivot 

 errors of the Radeliffe Transit-Circle. 

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

 <n,^. 65, L.iiJ.'), (56-79, with pL). 



3100 MICROMETER, VISUAL 

 AN'D PHOTOGRAPHIC. 



Eefraction, Aberration. 



Bocsardi, Giovanni, iletodo di ridu- 

 zione delle lastre del Catalogo stellare 

 fotografico per le zone di Catania. 

 Catauia, .\Iem. Soc. spettroscop. ital.,32, 

 190-3, (0-22, 31-45, 71-96, 113-133;. 



Meldola, L. Un nuovo grafico per la 

 prima riduzione delle misure stellari 

 fotografiche. Catania, Mem. Soc. spet- 

 troscop. ital., 32, J 903, (272-276, con 

 1 tav.J. 



Plummer, H. C. Note on the optical 

 distortion of the microscope of one of 

 the (Oxford macliines for measuring 

 astronomical photographs. London, 

 Mon. Not. R. Astr. Soc, 64, 1901, (640- 

 644j. 



Note on the influence of 



the plate constants on the accuracy of 

 die position of an object measured on a 

 photograph. London, Mon. Not. R. 

 Astr. Soc, 64, 1904, (645-647). 



3230 PERSONAL EQUATIONS. 



Cohn, Fritz. Beitrage zur Kenntnis 

 <.ler Helligkeitsgleichung bei Durch- 

 gangsbeobachtungen. Astr. Nachr., Kiel, 

 165, 1901, (21.5-2.52). 



Langley, S[amuel] r[ierpont]. A 

 method of avoiding personal equation in 

 transit observations. Washington, D.C., 

 •Smithsonian Inst. Misc. Collect. Q., 45, 

 1904, (225-229, with pi.). Separate. 

 25 cm. 



Miiller, Aloys. Die Physiologic in 

 der Astronomic. Kultur, Wien, 2, (1 900- 

 1901), 1901,(280-293). 



Stroele, II. Remarques conccrnant 

 I'article de M. F. Boquet sur I'equation 

 decimale. Bui. astr., Paris, 20, 1903, 

 (289-291). 



1-51 3300 



3220 ERRORS OF SCREWS, 

 CIRCLES, Etc, FLEXURE. 



Bigourdan, G. On a cause of varia- 

 bility of division - errors in certain 

 graduated circles. [Transl. from Paris, 

 C.-R. Acad. Sci.]. Observatorv, London, 

 28, 19U5, (52-54). 



Hough, S. S. On the determination 

 of the division errors of a graduated 

 circle. London, Mon. Not. R. Astr. 

 Soc. 64, 1904, (461-487). 



3240 PHOTOGRAPHIC MATE- 

 RIALS AND PROCESSES. 



Plates. Development. Fading of 

 Images. 



Fowle, F. E., jun. The absorption of 

 water vapor in the infra-red solar 

 spectrum. Washington, D.C., Smith- 

 sonian Inst., Misc, CoU. Q., 47, 1904, 

 (1-1 2j. Separate. 25 cm. 



Wood, R[obert] W[illiams]. Photo- 

 graphic reversals in specti-mn photo- 

 graphs. Astroph. J., Chicago, 111., 17, 

 1903, (361-372, with pL). 



Wilson, W. E. Photographs of the 

 Orion nebula. London, Rep. Brit. Ass., 

 1903, 1904, (567). 



Wolf, M. Absorption des Sternlichtes 

 durch den Kometen 1903 IV [Er- 

 scheinung auf der photogr. Platte]. 

 Astr. Nachr., Kiel, 164, 1904, (379-381). 



L'eber Hellicrkeitsscbat- 



zungen auf photographischen Flatten. 

 Astr. Nachr., Kiel, 165, 1904, (201-204). 



DETERMIXATIOX OF ASTROXOMI- 

 CAL CONSTAXTS BY OBSEL'- 

 V ATI OX. 



3300 



GENERAL. 



Wadsworth, IVrauk L[awton] 0[lcott]. 

 On the optical conditions required to 

 secure maximun» accuracy of measure- 

 ment in tlie use of the telescope and 

 spectroscope. Astroph. J., Chicago, 

 III.. 17, 1903, (1-19, 100-132). 



