, 162 



ASTRONOMY. 



IV. 



for latitude at Ohservaforij near the junction of 



By Lieut. A. W. Whipple, 



Date. 



7480 

 7528 



7547 

 7595 



7950 

 7997 



8058 

 8146 



8280 



8312 



7 

 66 



6867 

 6S93 



n 



7107 

 7120 



/; 



1 



7176 

 7206 



7302 

 7310 



_. w^ w > 1*1 ^ 



1849. 



• / // 



o / // 



1 



32 43 37.81 



1 

 .T^ 43 38 61 



;/ 



32 43 48.97 



• / // 

 Z-X 43 51.92 



u 



// 



*32 43 27.36 

 32 43 37.16 



7 



28.14 



25.74 

 29.04 



1 

 1 













32 43 41.60 



<1 



1 



42.49 41.31 

 40 56 4.1.40 



44.24 47.93 







1 





32 43 43.17 

 32 43 44.94 



A 





47.43 

 42.82 

 43.23 



5K31 

 50.93 



50.31 









40.43 



10 



35.37 





1 



43.21 

 44.66 

 46.04 



, ■■■> ■«#» 



44.31 



41.96 

 41.39 

 42.59 

 44.59 



36.82 

 38.10 



^ 43 51.31 



11 . . . 



■ 





41.72 



32 43 44.31 



1 



10 



27.40 



26.05 



39.34 

 36.54 

 37.76 



46.27 





39.11 ' 32 43 42.63 



n 









37.78 



39.96 32 43 37.95 



1 

 1 



ifii 



39.97 



1 



40.39 



42.88 









39.47 32 43 39.92 





' 





t 1 











o. t 



#4 /^ /\ ^ '^ 4 ^* 



44.94 



51.31 



44.31 



42.63 



37.95 



39.92 





Mean for each pair. 

 Mean of nine pairs 



F 



32 43 27.36 



:■ 



;j7,i6 



41.60 



4^.1^ 



32 43 42.54 



1 





1 



9 



1 







i 



Rejected. 



Y. 



Triangidation ly ichich the observed latitude and longitude of Camp Riley was trans/e 



to the Initial Point of the boundary on the Pacific: By Major Emory. 



MEASUREAfENT OF TlIE BASE LINE. 



(Unit of measure, a metre graduated hy Gamheij^ of Paris,) 



1st measurement, with rods made of seasoned red wood 4536.7895 metres, 



2d measurement, with steel wires belonging to SeKor Salazar^ surveyor of the Mexican commission 4536.60 



2) 3895 

 Result adopted ..- .--* 4536 . 6947 



SOLUTION OF THE TRIANGLE. 



East base 



West base 



Initial point 



Stations. 



East base to west base 



East base to initial point 



West base to initial point 



No. of obser-iObscrved angles, 

 vations. 



24 

 16 

 24 



Distribution 

 and error. 



• // // 

 37 25 57.5 



107 34 1.2 



35 1.2 



-f 0.033 

 + 0.033 

 + 0.033 



+ 01 



Spherical 

 excess. 



00 

 00 

 00 



Plane angles andj Logarithm.'? 

 distances. 





37 25 57.53 



107 34 1 .23 



35 1.23 



4536.39 

 7540 . 59 

 4807.56 



9.7837811 



9.7585949 



3.6567391 

 3.8774051 

 3,6819252 



Calculation of the Geograjphical Position of the Initial Point. 



Azimutli of the line from east base to initial point determined by measurement of angle made 

 with meridian of the observatory, and also by yarioiis measiirementB of the elongations o 

 Polaris : 



from 



' SV 



Latitude of east base situated precisely in the meridian of observatory at Camp Eiley^ an 



measur 



