WiLsotf IT al.] NEW YORK. 27 
Corrections. 
Foot. 
Page 410: Elevation at Oswego . .. . +0.765 
(Note: List of elevations under this title take varying corrections be- 
tween Oswego and Painted Post.) 
Page 431: Elevation at Addison +0.113 
Page 415: Elevation at Painted Post +0.104 
Page 437: Elevation at Corning +0.100 
FRANKLIN COUNTY. 
Precise Leveeing. 
The elevations published in the following list are based on a pri- 
mary bench mark of the Deep Waterways Commission at Fort Cov- 
ington, Franklin County, a 2-incli square cut on east abutment of the 
Grand Trunk Railroad bridge over Salmon River, 1 foot from the 
south edge and 1 foot from the east edge. The elevation of this is 
accepted as 166.355 feet above mean sea level. This elevation 
isderived by lowering that given by the Deep Waterways Commission 
for this bench mark 1.115 feet, this being the amount by which the 
elevation of a precise bench mark of that commission at Ilogansburg, 
Franklin County, lias been lowered, as published by the United States 
Coast and Geodetic Survey in its report for 1898-99, Appendix No. 8, 
page 543. This bench mark at Hogansburg is 1 lie center of a punch 
mark in a one-fourth-inch brass bolt cemented into the northeast f ace 
of 1 lie east buttress of the main tower of St. Patrick's ( at holic Church, 
near mark U.S.P., and its elevation is accepted at L78. 198 feet above 
mean sea level. 
This precise line being based on Fori Covington and not adjusted 
for closure error at Tupper Lake Junction gives a new value for the 
bench mark at the latter place as here published 0.076 greater than 
the published elevation of same in the Twenty- fust Annual Report of 
the Director of this Survey, page 393. This bench mark is an alumi- 
num tablet set in foundation of water tank of the New York Central 
Railroad, Adirondack Division, stamped "1555 ALBANY." 
The leveling was executed by Mr. C. H. Semper, levelman in charge, 
under the immediate supervision of Mr. H. M. Wilson, geographer. 
All bench marks are referred to the gristmill bench mark at Albany, 
t he elevation of which is accepted as 13.577 feet above mean sea level, 
and are stamped with the letters "ALBANY" in addition to their 
figures of elevation and year. 
TUPPER LAKE JUNCTION, VIA MOIRA AND BOMBAY, TO FORT COVINGTON. 
Feet. 
Tupper Lake Junction, New York Central Railroad, Adirondack Divi- 
sion; in foundation to water tank, aluminum tablet, marked "1555 
ALBANY" - 1,555.933 
Tupper Lake Junction. 2.8 miles north of; milepost "T. 5 & O. 123," 
top of rail at 1,604.6 
