SONORA LINE. 



167 



This latitude was obtained by a mean of results frjra observations Avitb zenith telescopes by 

 Lieutenant Michler and Seiior Jimenez, at their respective observatories near the initial p(»iiit, 

 (reduced to Lieutenant Michler's observatory,) as follows: 



O I It 



Determination by Seiior Jimenez 32 20 A\.7wy 



Determination by Lieutenant Michler 32 29 41.^7 



* 



Mean latitude 32 29 41. G5 North. 



This latitude of the observatory was then transferred to the initial i)oint, by f riangulation, 

 by Lieutenant Michler, By transferring the latitude of the monument near the junction to the 

 same observatory, by two different triangulations, one by Lieutenant Michler and the other by 

 Seiior A. Diaz, second engineer Mexican commission, the following were the results: 



O f tf 



Known latitude of the monument near the junction , 32 43 31,58 Xv»rth. 



Difference of latitude between monument and observatory, by 



Lieutenant Michler's triangulation 



13 48.95 



Latitude of observatory 32 29 42. G3 North. 



Known latitude of the monument near the junction 32 43 31.58 North. 



Difference of latitude between monument and observatory, 



by Seiior Diaz's triangulation — 



13 48.39 



Latitude of observatory 



32 29 43,19 North 

 32 29 42.63 '' 



Difference 



00.56 



The azimuth of the line from the junction of the Colorado and Gila, to Lieutenant Micliler'g 

 observatory, is, at the latter point, 3G^ 14' 10" northeast, audits length 104024.34 feet. 



The azimuth of the boundary line from the initial point on the Colorado to the intcrsfction 

 of the llltli meridian, west of Greenwich, and the parallel of 3P 20' north latitude, is at the 

 initial point Yl° 20' 43". 8 southeast, and at the point of intersection of parallel and meridian 

 69° 19' 45",94 northwest; the length of this line = 382844.87 metres, =: 418684.3 yards, 



= 237.63565 English miles. 



Monument Ko. II, made of cast-iron plates, and pyramidal in form, was placed on the edge 

 of the desert, at a distance from the initial point of 4522.9 yards ] its latitude was computed to 

 be 32° 29' 01'M8 north ; its longitude 114° 46' 14".43 west of Greenwich. The azimuth of 

 the boundary line at this point was computed to be 71"" 19' 23'M8 southeast. 



Q 



ments 



tions, commencing July 23, 1856, and ending August 2, 1856, inclusive, was found to be 



112 



o 



) 



Q 



from forty o^bservations upon eight pairs of stars with zenith telescope, was found to be 



57 



