of the pile bents. The double-deck construction
extended for the full length of the original pier. A single-deck
extension, of full width and 180 ft. in length, was subsequently built
for the accommodation of four derricks for handling building material
and large rock. The piles for this extension were driven in three sets
of four rows each, similar to those in the old portion of the pier,
except that the bents were driven with a uniform spacing of 15 ft.
between centers. The three sets of bents were topped separately with
12 by 12-in. caps and 12 by 12-in. dock stringers; they were braced with
both cross and longitudinal low-water bracing, and were tied together by
a continuous 12 by 12-in. timber over the dock stringers and 12 by
12-in. packing pieces from stringer to stringer, each of these ties
being supported in the center of the span over the tunnels by two 2-in.
hog rods, Section "_A-A_," Fig. 4.

The south side of the upper deck of the pier carried three sets of nine
hoppers, each set covering 90 ft., a little less than the full length
between bulkheads of the largest deck scows, with 70 ft. clear between
sets, to allow for the length of a scow outside of the bulkhead and to
permit the free movement of boats. Each hopper occupied the full space
between two bents, and, as the caps were topped by strips of timber of
triangular section, with a width of 12 in. on the base and a height of
6 in., protected by a 6 by 6-in. steel angle, each set of hoppers
presented 90 lin. ft. of continuous dumping room. The bottoms of the
hoppers, set at an angle of 45 deg., were formed by 12 by 12-in. timbers
laid longitudinally, running continuously throughout each set, and
covered by 3-in. planking. The partitions were formed with 4-in. planks
securely spiked to uprights from the floor of the hoppers to the caps;
these partitions narrowed toward the front and bottom so as to fit
inside the chutes. Each hopper was lined on the bottom and sides with
1/2-in. steel plates, and the bottoms were subsequently armored with 2 by
1-in. square bars laid 3 in. on centers and bolted through the 12 by
12-in. flooring of the hoppers. The chutes, extending from the bottom of
the hoppers, were 20 ft. long and 7 ft. wide, in the clear; they were
formed entirely of steel plates, channels, and angles, and were
supported from the upper deck of the pier by chains; their lower ends
were 17 ft. above mean high tide and 14 ft. 6 in. from the string piece
o