252 ANNUAL KECORD OF SCIENCE AND INDUSTRY. 



of stations for the purpose of fixing with precision the lat- 

 itude and longitude of certain positions, as well as the geo- 

 graphical features, to serve as points of reference for the 

 more detailed work of a perfect astronomical and geodetic 

 triangulation. 



The stations adopted during the present year were one at 

 the Mormon Observatory, at Great Salt Lake City, under the 

 charge of Mr. J. H. Clark ; one at Georgetown, Colorado, un- 

 der F. Kampf, and another on Green River Crossing, Wyo- 

 ming, under Mr. William W. Marryatt. Professor Safford also 

 had charge of one at Santa Fe, New Mexico, while Professor 

 H. B. Herr, in addition to his duty of superintending the con- 

 struction of the permanent Army Observatory at Ogden, 

 Utah, was charged with that of conducting the observations 

 and signals necessary for the determination of the longitude 

 of this point, in reference to Salt Lake City, Utah, and the 

 Lake Survey Observatory at Detroit, Michigan. The Ogden 

 Observatory, consisting of a substantial brick building upon 

 a stone foundation, with three observing rooms, is said to 

 be nearly completed, and is to be fitted up with suitable ap- 

 paratus, to serve as the connecting statibn for the points 

 in the area between the forty-ninth and thirty-second parallels 

 of latitude, and the great eastern divide and the Sierra Ne- 

 vada in lonsjitude. 



With the aid of the observers at the stations just men- 

 tioned, and of local surveys conducted in connection with 

 them, the data for an accurate determination of the astro- 

 nomical co-ordinates of the following positions have been ob- 

 tained : Georgetown, Hughes, Colorado Springs, Lebanon, 

 and Trinidad, in Colorado ; Ogden, Utah ; Green River, 

 Wyoming ; Winnemucca and Virginia Cit}^, Nevada ; Boze- 

 man, near Fort Ellis, in Montana ; and Santa Fe and Fort 

 Union, in New Mexico. 



These stations for astronomical observation, whether per- 

 manent or transient, constitute the first division of Lieutenant 

 Wheeler's survey. 



The second is that of the moving field parties, these being 

 charged with the determinations in regard to the topography 

 of the country, its geology and natural history, its meteorol- 

 og}^ and other features. This field work was prosecuted 

 from three initial points : . namely. Salt Lake City ; Denver, 



