ARTICLE VI. 



RESULTS OF OBSERVATION WITH THE ZENITB TELESCOPE OP THE SAYRE 

 OBSERVATORY PROM APRIL 1, 1876, TO DECEMBER 27, 1898. 



BY CHARLES L, DOOLITTLE. 



Read April 4, 1902. 



In presenting for publication the definitive results of the series of Zenith Telescope 

 observations at the Sayrc Observatory, mention should be made of the financial assist- 

 ance rendered by the Trustees of the Gould Fund of the National Academy and by Mr. 

 Robert II. Sayre, the founder of the Observatory. Without this aid the final discussion 

 must have been deferred indefinitely. 



Among those who at different times have assisted in the work of computation, I wish 

 particularly to mention Messrs. Henry 0. Coffeen, IT. J. Woods, Henry B. Evans and 

 Eric Doolittle. ( - •'■ Doolittle. 



In Volume XX, Transactions of the American Philosophical Society, Article 

 III presents the results of observation with the Zenith Telescope of the Sayre Observa- 

 tory from January 19, 1894, to August; 19, I89f». The brief historical statement, there 

 given as to the inception and progress of the investigation does not require repetition. 



The present communication consists of three parts, as follows: 



I. investigation of the coordinates of the stars employed in the latitude work at 

 the Sayrc Observatory. 



II. Results of latitude determination from 1876 to 1891. 



III. Results of latitude and aberration from observations extending from October 

 10, 1892, to December 27, 1893. 



The star list is the result of a joint investigation undertaken by Henry B. Evans 

 and myself. Of the 254 stars, 74 are found in the new fundamental catalogue of New- 

 comb.* The coordinates of the remaining ISO have been deduced from what was 

 practically all material existing at the time of the reduction. 



* Catalogue of Fundamental Stars for 1875 and 1900, reduced to an Absolute System. Washington, 1808. 



