400 



KRETZ. 



on the distance of the plateholder from the object glass, and 

 may bear some relation to the scale value ; a question which 

 cannot be settled, however, until many more of the Rutherfurd 

 photographs have been independently reduced. In the last 

 column will be found remarks regarding the quality of the 

 plate, and the number of stars measured. 



Table I. — The Plates. 



Observatory of Lewis M. Rutherfurd, New York City. 

 Lat. = 40° 43^ 48^''. 5 Long. = 4^ 55™ 56^62 W. 



No. 



Exposures. 



Atmosphere. 



Telescope. 



Remarks. 



Date. 



Sid. Time. 



Bar. 



Att. 

 Ther. 



Ext. 

 Ther. 



Ther. 



Focus. 



I 



II 



III 



IV 



V 



VI 



VII 



VIII 



IX 



X 



XI 



XII 



XIII 



XIV 



1870. April 25. 

 1870. April 25. 

 1870. April 26. 

 1875. June 2. 

 1875. June 2 

 ^875. June 2. 

 1875. June 4. 



1875. June 4. 



1876. May 26. 

 1876. May 26. 

 1876. May 26. 

 1876. May 26. 

 1876. May 27. 

 1876. May 27. 



h m s 



13 24 08 



14 00 05 



12 20 55 

 14 16 18 



14 47 02 



15 1632 



14 43 12 



15 13 02 



13 27 18 



13 55 38 



14 24 52 



145332 

 13 20 38 



13 51 52 



30.260 

 30.260 

 30.200 

 30250 

 30.250 

 30.250 

 30.250 

 30.250 

 30.136 

 30.136 

 30. 136 

 30 136 

 30.086 

 30.086 





 53 

 53 

 58 

 60 

 60 

 60 

 68 

 68 

 59 

 59 

 59 

 59 

 66 

 66 





 47 

 47 

 53 

 56 

 56 

 56 

 66 

 66 

 55 

 55 

 55 

 55 

 63 

 63 





 53 

 53 

 58 

 60 

 60 

 60 

 70 

 70 

 60 

 60 

 60 

 60 

 65 

 65 



8.4 



8.4 



8.5 



7-7 



7-7 



7-7 



7.6 



7.6 



7-7 



7.7 



7-7 



7.7 



7.65 



7.65 



Good ; 13 stars. 

 Fair ; 1 7 stars. 

 Good ; 15 stars. 

 Good ; 20 stars. 

 Good ; 18 stars. 

 Good ; 22 stars. 

 Poor ; 16 stars. 

 Good ; 23 stars. 

 V.Good; 14 stars. 

 Good ; 16 stars. 

 Good ; 16 stars. 

 Fair; 16 stars. 

 Poor : 15 stars. 

 Fair; 1 6 stars. 



Measurement. — The fourteen plates were measured during 

 the winters 1 896-1 897 and 1 897-1 898, and one of them in the 

 fall of 1898. During the first year, three observers were en- 

 gaged in the work : Mr. William H. Hays, then graduate stu- 

 dent in astronomy. Dr. Schlesinger, and myself; after the spring 

 of 1897 only the latter two remained. In this connection, I 

 wish to thank the two gentlemen, Messrs. Hays and Schlesinger, 

 for their interested and arduous services rendered in my behalf. 



The older Repsold measuring machine of the observatory 

 was used throughout. A full description of one of these ex- 



(60) 



