634 



GEOLOGICAL SURVEY OF THE TERRITOKIES. 



ELEVATION OF BFEEALO, CLEVELA^^D DIEECTRIS, AND MEAN STJKFACE OF LAKE 



EEIE. 



Feet. 



Various datum-planes. 



9 a. 



>2 



First detennination. 



Mean tide at Albany, N. Y., by United States Coast 

 Survey leveling. 



Surface 'of water in Erie Canal at Buffalo, by report 

 of final levelings of Erie Canal, (see profiles acconi- 

 panyiug annual report of State engineer and sur- 

 veyor of New York, January 1, 1868, by J. P. Good- 

 soil.) 



"Water-prism of this section 9 feet deep ; bence, bot- 

 tom of canal at Buflalo. 



Surface of Erie Caual, Buffalo 



Bottom of Erie Canal, Buffalo 



Surface of Lake Erie, by observations at Cleveland 

 and Buffalo from 1844 to 1857, and published in 

 Smithsoni.an Contributions, by C. Whittlesey, 1860. 



Mean surface of Lake Erie at Buffalo , 



Do .. 



Cleveland directrix, by mean of a very favorable 

 month of synchronous observations at Buffalo and 

 Cleveland on surface of lake, by Mr. C. Whittle- 

 sey and Mr. J. Lathrop. 



Cleveland directrix 



Do 



4.84 

 568. 42 



Above M. T. foot of Eight- 

 eenth street. New York . 

 Above M. T. Albany 



.do 



Above bottom of Erie 

 Canal. 



568. 24 

 "'ii.'42' 



Above M. T. Albany . 



Above bottom of Erie 

 Caual, Buffalo. 



Mean surface of Lalie Erie from 1844 to 1857 



Second determination. 



Permanent United States Coast Survey bench on 

 granite block at Gloucester Ferry, N. J., by United 

 States Coast Survey Report of 1871. 



Mean tide in Delaware Kiver at Philadelphia, by 

 United States Coast Survey Report. 



Mean tide at Philadelphia 



Philadelphia city datum, by leveling of Mr. S. L. 

 Smedley, city-engineer and surveyor, and his assist- 

 ant, Mr. Herring, January 11, 1874. 



Philadelphia city datum 



Pennsylvania R. R. datum, by report of Mr. Wilson, 

 consulting-engineer of P. R. E., 1874. i 



Pennsylvania R. R. datum or base of levels, called 

 H. T. at Philadelphia. 



Harrisburgh, Market street depot track 



Do 



Pittsburgh, Union depot track 



Do 



(The above elevations are from a profile of the last 

 computations from releveling the whole line, agree^ 

 ing within one foot with the old construction-levels 

 at Pittsburgh. Report by Mr. Wilson, consulting- 

 engineer, April 20, 1874.) 



Alliance, by P. F. W. & C. R. R. profile, 1872 



Above M. S. of Lake Erie 

 from 1844 to 1857. 



8.10 

 4.751 

 6.632' 



Above M. T. Raritan Bay, 

 equal mean surface of 

 Atlantic. 



Below U.S. C.S. bench.... 



Above U. S. C. S. bench. 



1.819 



Below Philadelphia city 

 datura. 



313. 00 



'moo' 



Above P. R. Tl. datum . 

 Above P. R. R. datum . 



Alliance, (track) 



Cleveland directrix, by profile of C. & P. R. R., re- 

 ported by Mr. I. Pillsbury, February 11, 1858. 



Cleveland directrix 



Crestline, (track,) by profile of P. F. W. & C. E. R. .. . 



Crestline 



Cleveland directrix, by profile of C. C. C. & L R. E., 

 reported by Mr. I. Pillsbury, February 11, 1858. 



Cleveland directrix 



Cleveland directrix, mean of Crestline and Alliance 

 routes. 



Mean surface of Lake Erie 



Above Union depot, Pitts- 

 burgh. 



573.23 

 564.2) 



573. 0; 



575. 6i 



573. Ot 



8. 73; 



6.913 



319. 913 

 '744.913 



507. 55 



Below Alliance 



1, 081. 613 



407. 60 

 "577.' 30 ' 



Above Union depot, Pitts- 

 burgh. 



Below Crestline . 



1, 152. 51 



575. 21 

 5.74. 631 



Ihird determination. 



Mean tide Albany, by United St.ates Coast Survey 



Buffalo, N. Y. C' & L. S. R. R. depot track, by profile 



of N. Y. C. R. R. 

 Buffalo, N. Y. C. depot track , 



4.84 

 578. 23 



Above M. T. New York . 

 Above tide at Albany, as- 

 sumed to be M. T. 



583. 07 



