1877. ] 25 (Carll. 
crossing the P. & E. at Corry, which would have given another link to 
the Lake at Brocton. The published levels are so vague and uncertain 
that we must omit them also. Mr, Ashmead kindly permitted and assisted 
in a thorough search among the papers in his office at Oil City, but no pro- 
file or connected notes of the levels could be found. _ 
If our accepted elevations of Irvineton, Corry, and Union City are cor- 
rect, and we have every reason to believe that they are, it appears quite 
evident that there must be some mistake in the levels of the O. C. & A. R. 
and U. & T. Railways, otherwise they would agree with our accepted ele- 
vations if raised uniformly 13/ at all points, instead of 13/ at Irvineton, 9’ 
at Corry and 12’ at Union City. They start as we have shown at an eleva- 
tion of 1160’ at Irvineton, which represents 1162/ on the P. & E. profile, 
and running around by Oil City and Titusville reach Union City at 1257’ 
which should represent 1259’ on the P. & E. profile if all the levels were 
harmonious. From the published tables it would be inferred that the 
P. & E. Depot in the U. & T. tables was the same as the P. & E. depot in 
the P. & E. tables; but the U. & T. profile shows that the point 1257’ was 
the junction with the P. & E. and this junction is 1.39/ lower than the 
depot. There is therefore a disagreement of one foot or more between the 
two lines of levels from Irvineton to Union City, the P. & E. being about 
34 miles in lengthand the O. C. &A. R. and U. & T.about 92 miles. This 
is not sufficient to cast doubt upon the main line of levels and we therefore 
accept them as correct as far as Tryonville Junction, presuming that the 
error lies somewhere quite near Union City, for we find our levels there 
between the crossings and Depots to differ quite materially from those 
given by the U. & T. profile as will be seen by reference to Union City 
levels. : 
We now have these three points apparently well established. 
bys Hii MUTE care, <' los sat ciel ase: Inioyero as cin a co.cc aims ose e's 1320/ 
COAT SC BO Ea So So SRS NO aud 60 CeIn COO DE OUEMCU Don TIan > orate 14277 
[Debora SA Le nira a 2) atasrar at cheat eens "sin 05, SJe'a-Siala wins 0G, G16 she in Bahasa 1270’ 
Tryonville Junction is 111’ below Corry by O. C. & A. R. (VI). 
e Lae 49’ above Union City by U. & T. (VID). 
Then calculating the elevation of Tryonville J. from Corry and Union 
City we have : 
Tryonville by O. C. & A. R. levels 1427 — 111 = 1516 
rs Bytes 1 «« 1270 + 49 — 1319 
The relative elevations of Corry and Union City are well assured by the 
exact agreement of the P. & E. and A. & G. W. levels between those 
places, and we therefore can only conclude that there is an error of one 
foot to be accounted for on the U. & T. profile between Tryonville Junct. 
and Union City, and an error of 4’ on the O. C. & A. R. profile between 
Tryonville and Corry which we have been unable to place and must, 
therefore, leave for future adjustment. 
PROC. AMER, PHILOS. soc. xvir. 100. D 
