GAKDNEK.] 



GEOGRAPHY ELEVATION OF DATUM-POINTS. 



655 





Feet. 



Various datum-planes. 



Elevation in feet 

 above mean sur- 

 face of Atlantic 

 Ocean. 



Denver (D. P. & K. P.) depot 







5, 196. 58 





4, 767. 91 





Do 





9 964 49 



Cistern of Mount Lincoln barometer 



8, 991. 05 







Do 





14, 187. C3 



Summit of Mount Lincoln 



9, 100. 08 



Above Denver depot 



Do 





14, 296. 66 









ELEVATION OP POINTS OK THE OHIO PvIVEE. 



Pittsburgh, union depot track 



Pittsburgh, L. W. city-datum 



Do 



Pittsburgh, H. W. 1852 , 



Pittsburgh, H. W. 1832 , 



(These data are from report of city engineer, Mirch 



15,1871.) 

 Steuben\Tlle P. C. & St. L. E. K. depot tr.ick, by P. 



C. & St. L. E. E. 



Steubenville depot, P. C. & St. L. E. E 



Steubenville, L. W. in Ohio, by old P. & S. E. E 



Steubenville, L. "W. in Ohio 



Steubenville, about H. W. 1852, by C. & P. E. E 



Do 



Bridgeport, about H. W. 1852, by C. & P. E. E 



Bridgeport, about H. W. 1852 



(Bridgeport is opposite Wheeling.) 



Bollaire, 5 miles below Bridgeport, about H. "W". 1852, 

 by C. & P. E. E. 



Do - 



Wheeling, H. W. February 1832, by B. & O. E. E 



By the same report the channel is given at 



(These B. & O. E. E. results are considered too low, 

 as they give an improbable fall to the Ohio from 

 Steubenville. The L. W. fall from Pittsburgh to 

 Steubenville is known by the P. & S. E. E. survey to 

 be about one foot per mile. The report of the C. & 

 P. E. E. for Bellaire seems to give the most probable 

 result. From Steubenville to Bell.aire the distance 

 by river is about twenty-eight miles, therefore L. 

 W. at Bellaire, giving the maximum probable fall 

 one foot per mile.) 



Bellaire, L. W. about 



Bellaire, H. W. about 



Bellaire, about H. W. 1852, by report of C. & P. E. E .. 



Bellaire, about H. W. 1852 



(This result is about what it should be, for it is not 

 probable that the fall here is one foot per mile. If 

 the B. & O. E. E. result was true, it would give the 

 river a fall of 42 feet in 23 miles. I therefore con- 

 sider it most probable that Wheeling H. W. 1852 is 

 about 6G3 feot, and the B. & O. E. E. report of 637 

 for H. W. 1832 is some thirty feet too low.) 



Parkersburgh, by several reports of B. &, O. E. E. , 

 point not given. 



By the report of the engineers running the line from 

 Parkersburgh to Cincinnati, the B. & 0. P.arkers- 

 burgh L. W. 



(I accept the latter, because it accords best with the 

 next check at Point Pleasant, about seventy mUos 

 down the river.) 



Parkersburgh, L. W. in Ohio 



Point Pleasant, very L. W. at mouth of Great Ka- 

 nawha. 



By two lines of levels agreeing within a foot 



Portsmouth, Ohio, L. W. in Ohio Eiver, by C. & X. 

 E. E. report. 



Portsmouth, L. W 



Cincinnati, L. W. city base 



Indianapolis, union depot track 



Greoncastlo junction, by T. H. & I. E. E 



Hew Albany, passenger depot 



14. 74 



68.43 



103. 55 

 "'96.' 55' 



84.55 



60.3 

 65.1 



84.55 



523.7 

 573. 00 



522. 00 



94. 00 



721. 75 

 56.00 



326. 00 



Below Union depot track . 



Below Pittsburgh depot. 



Below L. W. in Ohio at 

 Pittsburgh. 



Above Cleveland directrix 



Above Cleveland directrix 



Above Cleveland directrix 



Above sea 



do 



Above Cleveland directrix 



Above M. T., Baltimore . 

 , do 



Above M.T.,Richmond,Va, 



Below L. Erie. 



Above M.T 



Above Union depot, Indi- 



.anapolis. 

 Below Greencastlo 



746. 00 



699. 20 

 729. 88 

 732. 95 



731. 26 

 630. 77 



679. 23 

 '672.'23 



660. 00 

 [637. 00] 

 [588. 00] 



660,00 



573, 00 

 522.00 



479.00 

 439. 74 



