GAKDNEE.] 



GEOGRAPHY ELEVATION OF DATUM-POINTS. 



645 



This result differs but 0.8 feet from that by the C. C. C. & I. R. R. 

 from Cleveland directrix. 



If we consider the depot track at Columbus, Ohio, as the point of 

 junction of two long, connected lines of levels from the sea, one being 

 from New York by the Erie Canal, surface of Lake Erie, C. C. 0. & I. R. 

 E., and the other by the Pa. R. R. and the P. C. & St. L. R. R., we should 

 have the elevation of Columbus by the former as 743.01 feet above the 

 sea, and by the latter as 741.11 feet. The difference between the two 

 is only 1.9 feet, though the shorter line of the two is over six hundred 

 miles in length. 



ELEVATION OF INDIANAPOLIS. 



Feet. 



Various datum-planes. 



i;1s--£o 



Cincinnati L. "W., city -base 



First determination. 



439. 74 



Cambridge, by W. W. VaL E. E 



Cambridge 



Indianapolis nnion depot, by P. C. & St. L. K. R 



Indianapolis union depot 



508. 00 



Above city-base . 



227. 00 



Below Cambridge. 



947. 74 



720. 74 



Second determination. 

 Indianapolis nnion depot, by I. C. & L. E. E . 



Indianapolis nnion depot track 



Third determination. 



City-datum of Fort Wayne, by report of city-engi- 

 neer, who says it was" brought by canal. As this 

 elevation of the city-datum is not from original 

 canal-reports, I do not dare to accept it, and prefer 

 the following, as previous results have shown the 

 C. C. C. & I. and P. F. W. & C. to be so reliable. 



Crestline, by C.C.C.&L E.E 



Fort Wayne depot 



Do 



Cleveland directrix 



Fort Wayne depot of P.F.W.& C 



City-datum, by city-engineer 



Fort Wavne, city-datum 



Fort Wayne, F. W. J. & S. E. E. depot 



Junction of F.W.M. &C.E.E 



Do 



Cambridge, by F. W. M. & C. E. E 



Cambridge 



Indianapolis union depot, by P. C. & St. L 



Indianapolis union depot 



(As it is not known that the depots at Fort Wayne, 

 referred to by the railroad-pro tiles, are the same as 

 those of the city-engineer's report, I do not feel cer- 

 tain of the connections by this line. I, therefore, 

 reject this determination, and use only the first and 

 second in the final result.) 



Final results. • 



Indianapolis union depot : 



First determination 



Second determination 



Mean adopted 



City-base Indianapolis is L. W. in White Eiver 



Indianapolis city-base 



Above point supposed to 

 be city-base because H. 

 W. 18.58 is 58 feet in 

 profile. 



196. 00 



577. 33 

 348. 00 

 229. 33 



Above Lake Erie . 



723. 75 



769. 08 



Above Cleveland directrix. 



Below Crestline 



Above Cleveland directrix. 



Below P. F. W. & C. depot. 



575. 68 

 805. 01 



789. 70 



8.1 

 6.0 



Below city-datum 



Above F. W. J. & S. depot. 



173. 88 

 "227." 00 



Above junction . . . 

 Below Cambridge. 



787. 60 

 "OGI.IS 

 "73148 



720. 74 

 722. 75 



721. 75 



Below union depot 



688. 67 



