Lesley.]

[Jan. 15,

VIII. Huntingdon and Broad Top R. R.

The levels on the Huntingdon and Broad Top R. R. and its Branches, were furnished by Mr. John Fulton, General Mining Engineer of the Cambria Iron Works at Johnstown, Pa.

The datum is 0 at grade on the Pennsylvania R. R. at Huntingdon. To this 614' are added, +7', to reduce all to mean Atlantic Ocean level.

This road has three coal branches up the three streams which drain the Broad Top Coal Region. It originally stopped at Everett; but has been continued to Bedford and Bridgeport under the name of the Bedford and Bridgeport Railroad. Table IX.

The elevations on the Bedford and Bridgeport R. R. were furnished by Mr. S. M. Prevost, Superintendent of the Bedford Division of the Pennsylvania R. R. The datum 0 of this road was at grade of the Pennsylvania R. R. at Huntingdon; which Mr Prevost called 610; while Mr. Wilson calls it 614. The difference of 4 feet has therefore, in the 2d column, been added to Mr. Prevost's figures, to make them agree with Mr. Wilson's figures, along the main line. The regular 7 feet addition has also been made in the second column to reduce to mean Atlantic Ocean level.

IX. Continued as the Bedford and Bridgeport R. R.

(a) Not the Bridgeport of Clearfield County in Table XIV.

(b) Continued as Baltimore, Connellsville & Pittsburgh R. R. Branch of the Baltimore and Ohio R. R.

XIII. Lewisburg, Centre and Spruce Creek R. R.

NOTE-The levels on the Lewisburg Centre and Spruce Creek R. R. were furnished by Mr. George W. Leuffer, Chief Engineer. Mr. Leuffer says, "I will remark that many of the Stations have, as yet, not been located. The tide levels are based upon a level furnished by A. B. Starr, Esq., Engineer of P. & E. R. R., of a point in abutment of Chilesquaque Bridge (of P. & E. R. R.), and this agrees so closely with the level of tide, as stated in printed table of Pennsylvania R. R. Co., of Tyrone City, that I am inclined to rely upon the levels I now enclose."

The first column, then, gives the figures of Mr. Leuffer.

The second column has 7 feet added to Mr. Leuffer's figures, on the supposition that his datum is Pennsylvania R. R. datum of high water at the Schuylkill Bridge.

The third column has 8 feet added (in addition, 15 feet in all) to agree with the final mean Atlantic Ocean level assigned to Tyrone, in the Pennsylvania R. R. list, No. I.

PROC. AMER. PHILOS. SOC. XVI. 97. J

The elevations on the Tyrone and Clearfield R. R. were copied from a profile in the office of the Pennsylvania R. R. Co. in Philadelphia. The datum is a point 60' below Tyrone, or as it appears on the profile elevation at Tyrone +840'. Mr. W. H. Wilson is authority for adding 60' to each elevation as shown on the profile.

In the second column seven feet are added to reduce to mean Atlantic Ocean Level.

* High tide, Schuylkill River, at Philadelphia?

+Calculated from the Lewisburg end.

Adjusted to the Pennsylvania R. R. record at the Tyrone end.

(a) Junction with Philadelphia and Erie R. R

(b) Through Paddy's Mountain.

(c) Forks of Penn's Creek.

(d) Mouth of Muddy Run.

(e) Summit of Penn's Valley, Head of Penn's Creek, and Head of Spring Creek, which enters Bald Eagle Creek after passing Bellefonte.

(f) End of Nittany Mountain.

(g) State Agricultural College.

(h) Half Moon Gap.

(i) At Warrior's Mark.

(j) Logan's Run.

(k) L. C. & Sp. Cr. R. R. here connects with the Pennsylvania R. R.

The elevations on the Bald Eagle Valley R. R. were copied from a profile in the office of the Pennsylvania R R. Company, at Philadelphia. The datum is the same as that of the P. R. R.

In the second column seven feet are added to reduce to mean Atlantic Ocean Level.

(a) Allegheny Mountain Summit.

(b) First Crossing.

(c) Second Crossing.

(d) Not the Bridgeport of Bedford County in Table IX.

Lesley.]

STATIONS.

Above Tide.] Ocean Level.

[Jan. 15,

(b) Junction with the Philadelphia and Erie R. R.

XVI. Bellefonte and Snow Shoe R. R.

The levels on the Bellefonte and Snow Shoe R. R. were furnished by Mr. I. L. Sommerville, Resident Engineer. The datum is that of the Pennsylvania R. R.

In the second column seven feet are added to reduce to mean Atlantic Ocean Level.

(c) Level of rail over the water.

(d) Middle coal bed at the Company's mines at Coal Hill.