Except for the forges and, toward the last,
the steam locomotives, not a pound of coal was burned on the work. The
use of the bucket and telpher also eliminated most of the objectionable
noise incident to the transfer of spoil from tunnel cars to ordinary
wagons at the shaft sites. Power plants were installed at the North
Shaft near First Avenue and at the rear of the 33d Street Intermediate
Shaft.
_First Avenue Plant._--Fig. 1, Plate LVIII, is a general view of the
First Avenue plant. The power-house at the corner of 34th Street and
First Avenue supplied compressed air for operating drills, shovels,
pumps, and hoists in the tunnels driven from the river shafts, and in it
three Laidlaw-Dunn-Gordon compressors were installed. The largest was a
32 by 20 by 30-in., two-stage, cross-compound, direct-connected to a
Fort Wayne 480 h.p., 230-volt, direct-current, constant-speed motor run
at 100 rev. per min. This compressor was rated at 2,870 cu. ft. of free
air per minute at a pressure of 100 lb. It was governed by throttling
the suction, the governor being controlled by the pressure in the air
receiver and the motor running continuously at a constant speed. The two
others were of similar type, one was 22-1/2 by 14 by 18-in., rated at
1,250 cu. ft. of free air at a pressure of 100 lb.
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