ll sharpeners, and one oil blower forge.

_2._--_Retaining-Wall Plant._

The retaining-wall plant was identical with that described for the first
period, with the addition of two Ransome 1-cu. yd., concrete mixers,
with vertical engines mounted on the same frame, using compressed air.

_3._--_Pit-Excavating Plant._

The pit-excavating plant included that listed for the first period and,
in addition, the following:

One Vulcan, 30-ton, steam shovel, with 1-cu. yd. dipper and a vertical
boiler.

One Ohio, 30-ton, steam shovel, with 1-cu. yd. dipper and a vertical
boiler.

Four guy derricks (50 to 80-ft. masts and 45 to 60-ft. booms),
operated by Lambert 7 by 10-in. engines, with two drums and swinging
gear, mounted with 25-h.p. vertical boilers, but driven by
compressed air.

Seventy Ingersoll-Rand rock drills, Nos. 1, 31/4, and 4.

Two Rand quarry bars, cutting 10 ft. in length at one set-up, and
mounted with No. 4 drill using a Z-bit.

_4._--_Transportation Plant._

Twenty-one H. K. Porter locomotives, 10 by 16-in., and 36-in. gauge.

Three Davenport locomotives, 9 by 16-in., and 36-in. gauge.

One hundred and forty Western dump-cars, each of 4 cu. yd. capacity.

One hundred and sixty-five flat cars, with iron skips, each of 4 cu.
yd. capacity.

_5._--_Dock Plant._

Four stiff-leg derricks on extension, having 35-ft. masts and 40-ft.
booms, and each operated by a 60-h.p. Lambert, three-drum, electric,
hoisting engine.

One stiff-leg derrick, on the south side of the pier on the upper
deck, with a 28-ft. mast operated by a three-drum Lambert engine
and a 25-h.p. vertical boiler.

One stiff-leg derrick, on the north side of the dock on the upper
deck, used exclusively for bringing in brick, electric conduit,
pipe, and other building material, operated when first erected by a
three-drum, steam-driven, Lambert, hoisting engine. This engine was
later changed to the derrick on the south side of the dock, and a
motor-driven Lambert engine from that derrick was substituted.

Eight electric telphers.

Ninth Avenue Twin-Tunnels Plant.

One stiff-leg derrick, previously used in retaining-wall work.

One Smith concrete mixer, 1 cu. yd. capacity, driven by attached air
engine.

Two cableways taken from the retaining-wall plant and used for mucking
out the tunnels after the center pier had been built;