652 



GEOLOGICAL SURVEY OF THE TERRITORIES. 



tofore relied on for this difference of elevation, was iutended for 352.51, 

 but altered in coj)ying. The remainder of the error was due to assum- 

 ing the old elevation of the Saint Louis directrix. 



ELEVATION OV DENVER, COLO. 



First deter7nination. 



State-line, eastern terminus of E!. P. E. R. track 



Kansas City, H. W. 1844 



State-line, K. P. R. E. track 



Denver .1 unction of K. P. & D. P. E. E., by K. P. R E. . 

 Denver junction 



Denver, D. P. & K. P. E. R. depot track, by D. P. profile. 

 Denver, D. P. & K. P. passenger-depot track 



Second determination. 



Cheyenne, U. P. depot track, by TJ. P. E. E 



Omaha, TJ. P. L. W. datura 



Cheyenne, TJ. P. E. E. depot track 



Denver, D. P. & K. P. R. R. depot, by D. P. R. R 



Denver, K. P. & D. P. R. R. passenger-depot track 



Third determination. 



Construction-station 3985, near Pino iJluff, on TJ. P. R. 



R.,byU.P.R.R. 

 station 3085 



Denver, D. P. depot, by a D. P. E. E. preliminary 



Denver, D. P. depot 



Final results. 



(1) Eirst determination... 

 (1) Second deteinii nation , 

 (0) Third determination . . 

 Mean with weights 



Adopted result. 



Denver, D. P. & K. P. E. E. passenger-depot track. 



Difference from the mean, by K. P. E. E 



Difference by TJ. P. R. R 



Feet. 



7.25 



4, 448. 70 



""is.'as 



5, 095. 00 



4, 113. 00 



101. 45 



5, 198. 97 

 5, 194. 20 

 5, 192. 35 

 5, 196. 58 



-f 2.39 

 - 2.38 



Various datum-planes. 



Below H. W. 1844, Kansas 

 City. 



Above state-line . 

 Below junction . . 



Above Omaha TJ. P. R. E., 

 L. W. datum. 



Below Cheyenne . 



Above Omaha L. "W. datum 



Above station 3985 TJ. P. 

 R.R. 



ByKP.R.E 



ByU.P.E.E. &D.P. 

 By D. P. preliminary . 







770. 77 

 763. 52 



5, 212. 22 

 '5,'i98.'97 



977. 90 

 6, 072. 90 



5, 194. 20 



5, 090. 90 

 5, 192. 35 



5, 196. 58 



The third determination is given no weight as against the construction- 

 levels of the same railroad. Such a close agreement between the U. P. arid 

 K. P. lines was not to be expected when we realize that for the last thousand 

 miles they are really indei)endeut, one being from Chicago, by way of 

 Saint Louis and Kansas City, and the other by way of Omaha and 

 Cheyenne. Though Denver is two thousand miles from the sea, this 

 determination of its elevation is probably very close to the result that 

 would be obtained by the most accurate line of levels run across the 

 country for scientific purposes 5 but a considerable error must pertain 

 to all results from the effect of the mass of the Eocky Mountains in de- 

 flecting the level from a truly horizontal position. We cannot tell how 

 much this error is until a most accurate geodetic belt is completed from 

 the Atlantic to the Eocky Mountains, and then, knowing the station- 

 errors or the deflection of the plumb-line along the belt, we may correct 

 the leveling proportionally. As this cannot be done for many years, 



