

Ex. Doc. No. 41. 



9 



r 



]ast points, ^vher.e the observations are multiplied, their places may 

 be* deperide.d upon to the nearest five seconds. 



ft 



•• . 0/ local time. ^ 



The local time was, in all cases, determined by altitudes of the 

 heavenly bodies on different sides of the meridian. 



The astronomical observations, 



in number, were computed, 



in the first place, by myself and Mr. Bestor, and subsequently by 

 Professor J. C. Hubbard- The results, as given in the appendix, 

 are the final computations of Professor Hubbard, whose well-earned 

 reputation as a computer entitle: his work to entire confiderlce. 

 These observations establish the geographical position of 52 points, 

 extending from Fort Leavenworth to the Pacific, most of which lie 

 in regions before undetermined. • 



* 



' Heights above the sea. 



At Fort Leavenworth, through the liberality of the medical de- 

 partment, I/was furnished with a syphon barometer, by Bunten, 

 No. 515, the comparison of which, with the standard at Paris, is 

 given in the subjoined note. 



■ 



Ohservatoire. — Comparaison du barometre a Syphon, No. 515 de 

 Bunten, avec le barometre de Pobservatoire. 

 Paris, le..... :•,....,.. ; .^ 184^ 



Le barometre No. 515, donne^ des hauteurs plus grandes que 

 cclles qui sorit indiquees par le barometre de Pobservatoire, la dif- 

 ference e^t de 0.45 centieraes de millimetre. 



-n ^i S No. 515 759.19 



Jiarometre, < -^, , - r^-o ^r. 



^ * Ubservatoire 7ob,74 



Difference +0.45 



Barometre de. 



Xo^ 515 



12.9 

 12.0 



11.3 



10.3 



8.7 



758 . 20 

 761.50 

 762.14 

 758.06 

 753.80 



2.25 

 +0.45 



758.60 

 762.00 

 762.70 

 758.50 

 756.15 



12.5 

 11.8 

 11.0 

 10.0 



8.8 



Pari 



s, ^e 3 Fevrier, 1843. 



GORYOZ. 



The distussion of the data upon which the heights indicated by 

 the barometer have been founded, would, if pursued, occupy some 

 space; for the present, it»wiU be sufficient to say that the basis of 



