8th, 1905.]

_2._--_Retaining-Wall Plant._

Three cableways, with 35-ft. towers of 12 by 12-in. yellow pine timber
capable of spanning 350 ft., and operated by 7 by 10-in. double-drum
Lambert hoisting engines mounted with 25-h.p. Lambert upright
boilers.

Five stiff-leg derricks, with masts from 35 to 50 ft. long and booms
from 45 to 60 ft. long, operated by 7 by 10-in. Lambert double-drum
and swinging gear engines, mounted with 25-h.p. upright Lambert
boilers.

Six Cameron pumps, varying in size from 7 by 6 by 13 in. to 10 by 8
by 16 in. The first dimension referring to the diameter of the steam
cylinder, the second to that of the water, and the third to the
stroke.

Five Rand sheeting drivers.

Two Ransome 3/4-cu. yd. concrete mixers, mounted on frame, with
kerosene driving engine.

Drills drawn from pit plant as required.

_3._--Pit-Excavating Plant.

One guy derrick, 50-ft. mast and 45-ft. boom, operated by a Lambert
two-drum and swing-gear hoisting engine, with Lambert 25-h.p.
upright boiler.

Three stiff-leg derricks, similar to those used on the retaining wall
work.

Three Bucyrus, 70-ton steam shovels with 31/2-cu. yd. dippers.

One traveling derrick, built with an A-frame of 12 by 12-in. timbers,
15-ft. mast, and 25-ft. boom; the traveler carried an engine and
boiler similar to those used on the stiff-leg derricks, and was
used on the Seventh and Eighth Avenue sewers, as well as in the pit.

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

One Reliance stone crusher (nominal capacity 17 tons of crushed stone
per hour) belt-driven by 50-h.p. engine.

_4._--_Transportation Plant._

During the whole of the first period the transportation plant
consisted of two-horse trucks and snatch teams as needed. The number
varied greatly from 25 at the beginning and end of the period to an
average of 135 from August 1st to December 1st, 1904, about 10% of
the total number of teams being used as snatch teams.

_5._--_Dock Plant._

The only machinery used on the dock during the horse-and-truck period
was one stiff-leg derrick similar in size and operation to those
described under the head of retaining-wall plant.

The plant described above does not represent that which was used during
the whole of the horse-and-truck period, but what had accumulated at the
end of it. The power-ge