wilson et ai,. ] PENNSYLVANIA. 61 
Feet. 
Mahoning, 6 miles east of; iron bridge over Mahoning Creek known as 
"Macks Bridge;"' on southeast bridge seat; chiseled mark □ . 863.84 
Mahoning, 4 miles east of; opposite mill by road north: nail in root of 
tree ... _ . . . .. 841.95 
Mahoning, 2 miles east of; iron bridge; southwest wing wall: coping 
stone, chiseled mark □ . . . . .. . . ; . . . . . .... 833. 51 
Mahoning, Allegheny Valley Railroad, opposite station at; top of rail 819.1 
Rimerton, 2 miles south of; railroad bridge; northwest abutment; cop- 
per tablet, marked •' 820 PITTSBURG- 1899" 821.148 
INDIANA AND WESTMORELAND COUNTIES. 
Indiana, Elders Ridge, and Latrobe Quadrangles. 
The elevations published, in the following list arc based upon vari- 
ous bench marks of the Pennsylvania Railroad on lines from West 
Penn Junction, via Blairsville intersection, to Bradclock, the eleva- 
tions of which are derived by applying various corrections to those 
listed in their publication of May 1, 1899, in conformity with the 
latest adjustment of the United States Coast and Geodetic Survey, 
in 1900, which makes the elevation as accepted for Blairsville inter- 
section, bench mark Pennsylvania Railroad No. 47, a square cut on 
stone monument, 25 feet south of tool house, 1,120.113 feet above mean 
sea level. 
The leveling was executed under the direction of Mr. Frank Sutton, 
topographer, by Mr. J. II. Wet/el, Levelman, in 1900, 
All bench marks are referred to an aluminum tablet set in founda- 
tion of Seventh Avenue Hotel at Pittsburg, marked "'738 PITTS- 
BURG 1899," the elevation of which is accepted as 738.718 feet above 
mean sea level, and are stamped with the letters "PITTSBURG" in 
addition to the figures of elevation. 
SALTSBURG, VIA NEW ALEXANDRIA, TO LATROBE AND MILLWOOD. 
Feet. 
Saltsburg. Pennsylvania Railroad passenger station; baggage-room door 
sill 855. 96 
Saltsburg, wooden covered bridge over Kiskiminitas River; on north- 
east wing wall, west end. aluminum tablet, marked "849 PITTS- 
BURG" ... . 848.959 
New Alexandria, 2 miles north of; covered bridge over Loyahanna 
Creek: on north end of . . 935 
New Alexandria, wooden covered bridge over Loyahanna Creek; south- 
east wing wall, on coping stone, tablet, marked " 945 PITTSBURG "_ 945. 368 
New Alexandria, 500 feet north of Pennsylvania Railroad station: east 
side of road, nail in root of large oak tree, Pennsylvania Railroad 
bench mark No. 407 ... _ . 975. 81 
Georges Station, overhead bridge; on north pier of, aluminum tablet, 
marked "1199 PITTSBURG'' 1,199.560 
Latrobe, high school building; aluminum tablet _ . 1, 026. 585 
Millwood, overhead bridge; south abutment, on southwest coping stone, 
marked " 1175 PITTSBURG " . 1,175.668 
