APPENDIX 13. 



ASTRONOMICAL onsKUVATloXS AND < :K< H.KAI'l NCAL POSITIONS OF T1IK MOST IMPORTANT l'OIN'I 



The subjoined letters of Lieut. H. S. Putman, Topographical Engineers, and 



Mr. D. G. Major, with the Table of Geographical Positions, give all needful in torn 

 tion in respect to this portion of the expedition. The sextant observations were duel 

 made bv niv assistant, Lieut. J. L. K. Smith, Topographical Fngineers: the tran 

 observations' bv Lieut. H. S. Putman, and those for lunar distance by boll, these oi 

 eers and myself, the altitude of the moon and star, as well as the angular distan< 

 being- taken at the same instant of time. 



The chief fact noticeable in the results is the disagreement between our longitm 

 and those of Colonel Fremont at Great Salt Lake City, the north bend of Walke 

 River, and at Genoa, the western termination of our routes, where our exploratio 



In Fremont's second expedition (1843-44) he makes the longitude of the sui 



mit of Fremont Island, in Great Salt Lake, west of Greenwich 112° 21' 05". Aecoi 

 in-.- to Stansbury's rii/id Triangular survey of Great Salt Lake, Salt Lake City is east 

 this summit -Jr/oO".'" This makes the longitude of Salt Lake City, as derived fr< 



In Fremont's report of this expedition he remarks that "in this exploration. 

 became evident that the longitudes established during the campaign of 1842 were c 

 lectirely thrown too for to the westward." He therefore abandons his determinations 

 hi 8 first expeditions, and assumes as correct those of his second. In his third expediti 

 (of 1845-4G) he does not compare his longitudes with those of his previous expe, 

 ti nlls; but, instituting a comparison myself, 1 find the result as follows: In tins tin 

 expedition be makes"one set of transit' observations Oetober 20, lX4f>, of the moon a 

 moon-culminating stars, at the present 

 longitude to be 112° 06' 08". That is, 

 this expedition 10' 42" neater than in his second: or, in other words, moves collec- 

 tively his positions back again westwardly 10' 42". 



Xow our observations of the transit of the moon and moon-culminating stars at 

 CamnFlovd, consisting of five complete sets, made during two lunations, in the months 

 of March and Vpril isf,x <dve a resulting longitude for this post of 112° 08 0< . 

 Chronometricallv, 1 found Great Salt Lake City east of Camp Floyd, 13' 07". Tins 





