796 



GEOLOGICAL SUEVEY OF THE TERRITOEIES. 



At Fort Hall I observed througli one lunation, obtaining seven cul- 

 minations, which gave the result submitted below, with a possible error 

 of 7.4 seconds. 



The latitude of Fort Ellis, and of allother stations besides Fort Hall, 

 was determined with the sextant, by observations on Polaris and a south 

 star, whenever possible, anci on the sun whenever tbe movements of the 

 party permitted. 



For the determination of the longitude of Fort Ellis, I succeeded in 

 obtaining only two moon culminations. I have adopted the longitude 

 given by chronometer in preference. 



The longitudes of the other stations in the list of astronomical posi- 

 tions appended depend on observations with the sextant on the east 

 and west stars, or on the sun, and the rate of the chronometer. This 

 has been exceptionally good, having lost from observations made at 

 Salt Lake City at the beginning and end ot the trip, by 2 minutes, 13.65 

 seconds, between May 28 and October 29. Its rate was checked during 

 the season by returning to Port Ellis, the Three Forks of the Missouri, 

 and Fort Hall, and, in all cases, was found to be very uniform. 



YELLOWSTONE DIVISION. 

 List of astronomical positions. 



Fort Hall, Idaho, 



Virginia City, Mont., (Uuited States signal-service office) 



Fort Ellis, Mont., (camp 1) 



Helena, Mont,, ( survey or-general's office) 



Camp 3 



Camii 4, Bottler's Eancb 



Camp 5 



Camp 6 - 



Mouth of Gardiner's River, northern boundary of Yellow- 

 stone National Park 



White Mountain Hot Springs, (camp 7) 



Camp 8 



Camp 9 



Yellowstone Falls, (camp 11) 



Camp 12 



Head of Yellowstone River, at lake 



Camp 13 



Lower Geyser Basin, (camp 14) 



Camp 15 



Camp 16 



Camj) 17 



Camp IS 



Camp 19 



Camp 21 



Camp 22 



Camp 25 



Three Forks of the Missouri, (camp 27) 



Camp 28 



CamiJ 35. 



Camp 36 



Camp 39 



Camp 41 



Camp 42 



Camp 43 



Camp 44 



Western boundary of Yellowstone National Park 



Southern boundary- of Yellowstone Nat'i Park, (appros). 

 Eastern boundary of Yellowstone Nat'l Park, (approx).. 



43 8 54. 98 



45 19 1. 5 



45 40 40 



46 35 36.8 

 45 26 20.6 

 45 19 58 

 45 12 27. 1 

 45 4 52. 9 



112 

 111 

 111 



45 2 



44 58 



44 59 



44 56 



44 44 



44 36 



44 32 



44 35 



44 34 



44 38 



44 41 



44 48 



44 52 



44 50 



45 7 

 45 13 

 45 39 

 45 55 

 45 47 

 45 14 

 45 10 

 45 34 

 45 44 

 45 51 



45 58 



46 1 



2 



31.2 

 27.8 



8.2 

 17.1 

 26.3 

 47.3 

 3.5.4 

 30.6 

 32.2 

 30.2 

 15.7 

 47.4 

 43.3 

 35.3 



4.1 

 19.4 

 51 



5L8 

 51.1 

 58.6 



8.1 

 14.4 

 56 

 19 

 17 



6 30 



56 30 



15 



111 52 45 



110 46 58 



110 50 15 



110 56 30 



110 50 26 



110 43 15 



110 43 25 



110 36 30 



110 30 10 



110 33 48 



110 32 27 



110 32 14 



110 50 35 



110 55 15 



110 .58 54 



111 8 52 

 111 23 45 

 111 26 36 

 111 33 27 

 111 44 

 111 50 12 

 111 40 40 

 111 34 6 

 111 16 31 

 111 21 46 

 111 12 5 

 110 39 10 

 110 58 23 



110 58 42 



111 10 15 

 111 29 40 

 111 14 33 



44 9 30 



110 9 



