1876.]

[Lesley.

II. READING SERIES.

L. Philadelphia and Reading R. R.

The elevations at the following points on the Philadelphia and Reading Railroad and Branches, were furnished by Mr. Wm. Lorenz, Chief Engineer.

The number of stations given in the tables, are few, but no others could be obtained.

The datum is mid tide at Philadelphia.

To this must be added 3.349 feet to reduce to Atlantic Ocean Level.

a Richmond Street Bridge, near the Coal Depots on the Delaware River. b In Philadelphia, near the Germantown Road. The Germantown R. R.

LI. Germantown and Norristown Branch P. & R. R. R.

crosses the P. & R. R. R. in Nicetown on a bridge at an elevation of 132 (135). feet; but not at this summit. Table LI.

e Norristown opposite Bridgeport is given in this list as 62 (65.) See Table LI. Bridgeport is at the Junction of the Chester Valley R. R. See Table LII. R. R. to King of Prussia; no levels furnished.

d Perkiomen R. R.

e Pickering Valley R. R.

ƒ Colebrookdale R. R.

g Wilmington and Reading R. R.

h Lebanon Valley R. R. Reading and Columbia R. R. East Penn R. R.

i Little Schuylkill R. R.

j Schuylkill and Susquehanna R. R.

k West Branch R. R.

7 Mill Creek R. R. Schuylkill Valley R. R.

a Depot at the corner of 9th and Green Streets.

b Crosses the P. & R. R. R. on a bridge, but not at the Nicetown Summit mentioned in Table L.

m Probably the old Depot.

n The N. Penn. R. R. level, Stony Creek branch, is 50 (62 Ocean level).

1876.]

[Lesley.

LII. Chester Valley Railroad

The levels on the Chester Valley Railroad, were furnished by Mr. W. H. Holstein, Secretary of the Chester Valley Railroad Company.

The road connects with the Philadelphia and Reading Railroad at Bridgeport, and with the Pennsylvania R. R. at Downingtown.

The base of the levels is mid tide at Philadelphia. Add 3.349 to reduce to Ocean level.

Of this line only one level was furnished.

Datum (Reading R. R.) mean tide at Philadelphia. Add 3.349 for Ocean level.

Lesley.]

STATIONS.

LIV. Perkiomen R. R.

Perkiomen Junction (a)...... .L

Oaks...

Doe Run

Yerke's

Collegeville...

Rahn's.

Grater's Ford

a Junction with Philadelphia and Reading R. R.

b Crosses Pennsylvania R. R.

c Crosses Philadelphia and Baltimore R. R.

d Connects with Philadelphia, Wilmington and Baltimore R. R.

[Jan. 15,

LVI. Wilmington and Reading R. R.

These levels of the Wilmington and Reading R. R. were furnished by Mr. E.
Collings, Superintendent.

The datum, or base of levels, is low tide at Wilmington, Del. Relation of
Ocean Level to this datum is unknown.

a Junction with Philadelphia and Reading R. R. at Birdsboro, Berks County,
Pennsylvania.

b Junction with E. Brandywine and Waynesburg R. R., Chester County, Pa.
e The Pennsylvania R. R. track on bridge just west of Coatesville Station is
62′ higher than track on W. & R. R. R. The elevation on Pennsylvania R. R. at
the point where it crosses the W. & R. R. R. is 374' above tide. By deducting 62'
according to Pennsylvania R. R. datum the elevation would be 312′. The datum
of the Pennsylvania R. R. is high tide in Schuylkill River. The datum of W.
& R. R. R. is low tide at Wilmington.

PROC. AMER. PHILOS. SOC. XVI, 97. L