LONGITUDE OF WESTERN BOUNDARY LINE. 



153 



ALTITUDES OF A URSJl MINORIS. 



1865. September 3. @ evening. 







Double altitude. 







Chronometer. 









Resulting latitude. 







(uncorrected.) 







h. 



min. 



sec. 



deg. 



min. 



sec. 



deg. 



min. sec. 





18 



58 



13 



84 



4 



10 



42 



14 



10.0 





19 



1 



3 



84 



6 



8 



42 



14 



10.0 





19 



3 



57 



84 



8 



20 



42 



14 



11.0 





19 



8 



20 



84 



12 



45 



42 



14 



36.0 





19 



12 



24 



84 



15 



35 



42 



14 



41.0 





19 



15 



13 



84 



17 



15 



42 



14 



31.0 





19 



19 



20 



84 



19 



35 



42 



14 



4.0 





19 



21 



4 



84 



21 



55 



42 



14 



40.0 





Meai 



1,,, 









42 



14 



22.9 



±3.70 













The index error was = + 2' 15' ' (mean of 8). The correction of 

 the chronometer = — 17"" 38^, and the special tables in the Greenwich 

 Nautical Almanac have been used in the reductions. 



Resuming, we have therefore for the latitude of the observing station : 



From O 42° 14' 29".l ± 3".69 



From a Ursse min. 42° 14' 22".9 ± 3".70 



Mean 42° 14' 26".0 ± 2".74 



3. Co-ordinates of the Monuments. 



As has already been stated, the distances from the two nearest monu- 

 ments have been measured along the boimdary supposed to be a meridian, 

 and the northernmost monument, or that nearest the shore of Lake Erie, 

 was found 



9,795 feet north of the parallel of the observing station; 

 the second monument 



6,471 feet south of the same. 



It would seem as if the two stones were intended to be three miles 

 = 15,840 feet apart; the present measurement makes the distance 426 

 feet greater. But for the purpose here in view, this difference was not 

 deemed of sufficient importance to warrant the trouble of a repetition of 



Cab. Nat. 20 



