hoppers, set at an angle of 45°, 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
½-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
of the pier. The hoppers and chutes are shown by Fig. 1, Plate LVI.

[Illustration:
Plate LV.
Material Trestle Over N.Y.C. & H.R.R.R. Co.'s Tracks;
and Construction of Pier No. 72, North River
Fig. 1.--Material Trestle Over N.Y.C. & H.R.R.R. Co.'s Tracks.
Fig. 2.--Material Trestle Under Construction on Pier No. 72,
North River, Showing Clear Water Over Tunnel Location.
Fig. 3.--Pier No. 72, North River, Showing Incline as Reconstructed
For Locomotives.]

A length of 150 ft. of the north side of the pier was for the use of the
contractor for the North River tunnels; it was equipped with a set of
nine chutes similar to those for the south side; they were used but
little, and were finally removed to make room for a cableway for
unloading sand and crushed stone.