OISXKUVATIONH WITH Til hi ZKNITII TELESCOPE. 





Date. 



Mean 



Temperature. 



Assumed YJi. 



Computed 

 A&B. 



|/ wt. 



Adjusted A'AR- 



v. 



1 



1891 Jan. 1!) Feb. 



16 



880.8 



25.2070 



+ .0385 



1. 



■ + .0895 



+ io 



2 



Feb. L9-Mar. 



18 



85.3 





-f 0882 



1.0 



-1- .0300 



— 13 



8 



Mar. 19-Apr. 



80 



4 1 ;.:; 





-f 0851 



0.7 



+ .0342 



— 9 



4 



May 8-. 1 line 



11 



60.7 





+ 0317 



1.0 



+ .0818 



— 4 



5 



June L8-July 



5 



72.4 





+ 0288 



1.0 



-f 03b7 



+ 24 



(i 



July 9-July 



25 



70.8 





+ 0302 



1.0 



-f 0290 



— 18 



7 



Aug. B-Sept. 



15 



66.2 



25.282:: 



— 0176 



1.0 



— 0100 



+ 76 



8 



Oct. 2- Nov. 



12 



47.0 





- 0083 



1.0 



— 0057 



+ 20 



!) 



Nov. 15 Deo, 



6 



85.5 





— 0077 



1.0 



— 0032 



+ 45 



10 



Dee. 2. r >-,J:m. 



24 



21.5 



25.28075 



— 0020 



0.7 



— 0015.5 



— 25 



II 



ISD5. Jan. 27 Mar. 



28 



88.9 





— 0040 



1.0 



— 0001 5 



— 22 



i a 



A.pr. 10- Mar. 



(t 



47.:! 





— 0005 



0.7 



— 0102.5 



— 37 



L8 



May 9-June 



2!) 



68.0 





— 0123 



1.0 



— 0134.5 



— 11 



14 



July 9-Aug. 



1!) 



67.6 





0004 



1.0 



— 0147.5 



— 83 



A graphic construction showed that the values of Ul might be approximately repre- 

 sented by the expressions — 



25". 2939 + x + (t— 21".5) s before July 25, 1894. 

 25". 2047 + y + (t — 21 l >,5) 1 after July 25, 1894. 



Solving the resulting equations Por x, y and z, these expressions beconw — 



25".3075 -- 2.21 (t — Sl°.5). 

 25 ". 2647 — 8. 81 (t — 21 (, .5). 



t being the mean temperature and the coefficient 2.21 expressed in units of the fourth 

 decimal place of the screw value. 



From these expressions result the adjusted values given in the foregoing table. 



The agreement is not altogether satisfactory, as shown by the residuals— in fact, it 

 would, perhaps, haves been better to make a strictly empirical adjustment. However, no 

 appreciable difference could have followed in the final treatment of the latitudes. 



No correction has been applied for periodic errors. A former attempt to determine 

 (his correction by means of Harkness' measuring engine was not successful ; it seemed to 

 be quite small, and it will be pretty effectually eliminated from the mean of a consider- 

 able number of measurements. 



The Star List. 



The derivation of the best attainable values of the star declinations employed lias 

 formed a relatively small part of a more; extended undertaking, viz. : that of investigat- 

 ing the coordinates of all stars employed in the latitude work of the Sayre Observatory. 



This subject will not be treated in detail at present, as the plan involves a, more 

 extended presentation in another place. 



