DESCRIPTIONS OF BENCH MARKS
 

BOROUGH   OF   MANHATTAN.

B. M. 738.—Governors Island. The bottom of a 2j^-inch square cut in the coping
of the granite sea wall on the east side of Governors Island, opposite the foot of Ham¬
ilton Avenue, Brooklyn. The bench mark is near the southeast corner of the coping
stone, is south of the transformer house and just east of the Quartermaster's building
(two-story and attic red brick), opposite a point about 11 feet south of the north end.
The letter B is cut in the stone on the west side of the point.    (Note 4, p. 89.)

Elevation, 7.133 feet

B. M, 739.—Governors Island. The center of a '/is-inch drill hole in the center of
the cross in the cornerstone of the Chapel of Saint Cornelius the Centurian, on the
easterly side of Governors Island. The Chapel is a white limestone structure, is about
150 feet north of Corbin Hall, and the cornerstone contains the inscription A. D, 1905
below the cross, which is on the north side of the Chapel about 3 feet above the
ground.

Elevation, 16540 feet

B. M, 740.—Governors Island. Coast and Geodetic Survey E. M. I. A cross (-{-)
cut in the south end of the bluestone door-sill at the main entrance into Castle Wil¬
liam. The bench mark is on the east side of the old fort, is 3;^ inches from the
south end of the sill and 3 inches from the east edge.    Established in 1886,

Elevation, 8,539 feet.

B. M. 741.—Governors Island. Coast and Geodetic Survey B. M. H. A cross (-|-)
cut in the extreme northeast corner of the large stone having a ring bolt in the top
and forming part of the coping of the sea wall on the north side of Governors Island
in front of Castle William. It is about 100 feet west of the long dock. Established
in 1886.

Elevation, 7.999 feet.

B. M. 742,—Battery. A '/i-'iDch copper bolt leaded vertically in the granite coping
of the sea wall on the north side of the Battery Basin, on the west side of the new
United States Barge Office. The bolt is about 50 feet west of the northeast corner
of the basin and 1,6 feet east of a stone post. The letter B is cut in the coping just
south of the bolt.

Elevation, 7,041 feet

B. M. 743.—Battery. A 2-inch square (D) cut in the top of the third or top gran¬
ite step at the west side of the passenger entrance to the Thirty-ninth Street Ferry,
just east of the foot of Whitehall Street The bench mark is at the east side of the
wagon entrance to the Stapleton Ferry, and 2.1 feet from the south end of the step.

Elevation, 10.480 feet