26 SPIRIT LEVELING IN NEW YORK, 1896 TO 1905. 
CHAUTAUQUA AND ERIE COUNTIES. 
BUFFALO, DUNKIRK, EDEN, AM) SILVER CREEK QUADRANGLES. 
The elevations in the following list are the result of a line of precise levels connecti 
army engineers' bench marks at Buffalo and Dunkirk which were formerly established fro 
lake gaging. This line is an element in the precise-level net and became a factor in t 
adjustment made by the United States Coast and Geodetic Survey in the spring of 19C 
In accord with this adjustment a correction of 0.217 foot has been distributed proportion i 
to the distance throughout this line to the unadjusted results, raising the elevation at Du 
kirk 0.217 foot with respect to Buffalo. The unadjusted results close low 0.034 foot 
Dunkirk upon the latest unadjusted water levels from figures in part given by the W 
Department corrected to a common elevation at Buffalo. The water-level connection w. 
derived by comparisons made between Buffalo and Erie and between Erie and Dunkir 
The elevation at Dunkirk, upon the old army engineers' datum, was obtained from a loe 
office several years ago and no new records were obtainable, but the relative heights of tl 
Buffalo and Erie bench marks have been more correctly determined by addition of lati 
gage records. 
The water leveling to the Dunkirk bench mark has not entered as a factor in the adjus 
ment, since its weight was in doubt; there has thus been 0.184 foot correction made to tl 
water leveling between Buffalo and Dunkirk by the adjustment. 
The double-simultaneous method was employed with a Buff & Berger precise level and 
4-seeond vial. The total length of this doublc-rodded line is 40.87 miles, and the tot; 
divergence, 0.101 foot. The leveling was done during part of July and August, 1902, b 
Mr. D. H. Baldwin, topographer in charge. All standard bench marks dependent on th 
datum are stamped with the letters " ROCHESTER" in addition to the figures of elevatio 
and year. 
BUFFALO, ALONG THE LAKE SHORE AND MICHIGAN SOUTHERN RAIL 
WAY, TO DUNKIRK. 
BUFFALO QUADRANGLE. 
Feet. 
Buffalo (United States Engineers' bench mark and State Canal bench mark No. 553), South 
United States Pier Light House, upper surface of plinth; east angle stamped by ehiselingin 
stone so as to leave a rounded point 590. OS 
Buffalo, Michigan' Street 15 ridge over Buffalo ('reck ; surface of floor 5.S7. 
Buffalo, Lehigh Valley Railroad bench mark, northwest corner of bridge over Ohio Slip; in 
top of foundation stone; iron bolt 586. '-'-' 
1 '.ii Halo, northwest of New York Central switch tower, 24 feet from old stone milepost, 10 feet 
west of track; top of rail driven vertically in ground 589. 59 
Buffalo, grade crossing of Erie Railroad, four tracks; top of rail 585. 4 
Buffalo, southeast corner of three-span, iron-truss bridge, overhead crossing of the Delaware, 
Lackawanna and Western Railroad, on south corner of fourteenth step from top of wing 
wall about level with track; chiseled square 585. (i(i 
Buffalo (railroad bench mark), northwest corner two-span, steel-truss Bridge No. 267 over 
Buffalo River, southwest corner of parapet wall ; chiseled circle 591. 4$ 
West Seneca, 0.58 miles north of, end of trestle and two-span bridge overhead crossing, at 
north end of stone pier about 4 feet above main track, on coping stone; chiseled square 589. 16 
AY<\st Seneca, in front of station; top of rail 599.9 
West Seneca, 1.04 miles south of (New York Central Railroad bench mark), 20 feet south of 
survey station 606+50, 400 feet south of switch tower; top of rail driven vertically in ground. 59 1 . l'7 
Athol Springs, in front of station; top of rail 626. 
Athol Springs, 0.76 mile south of, milepost " B 11 " north face, 6 feet above ground; chiseled 
square 640. 54 
Athol Springs, 0.91 mile south of, southeast corner of stone-arch culvert bridge, in south face 
of coping stone; bronze tablet stamped "631 ROCHESTER 1902" 631. 11 
Athol Springs, 1.1 miles south of, road crossing to " Hamburg-on-the-Lake; " top of east rail . 636. <'> 
EDEN QUADRANGLE. 
Athol Springs, 1.79 miles south of, near Hamburg station on Pennsylvania Railroad, road 
crossing on Lake Shore and Michigan Southern Railway; top of rail 651. G 
