At the South Shaft the bins were of concrete and
steel, about 6 by 12 ft. in section, and attached to the central wall of
the caisson. Sand and stone were delivered into them from dump-wagons on
the loading platform. At the North Shaft steel-plate bins were used, and
were supplied with material by the buckets handled by the telpher. The
mixers were No. 5 Smith, belt-connected to 25-h.p. motors, and about 0.8
cu. yd. of concrete was mixed at a batch. The concrete cars were steel
side-dumpers of the Wiener or Koppel type.
In order to be able to continue concreting during the winter, when
neither sand nor stone could be obtained by water, practically all the
space under the loading platforms in the South Shaft yards not occupied
by the blacksmith shop was filled with these materials, which were
placed in storage in the late fall.
_Intermediate-Shaft Plant._--The air-compressing plant was located at
the rear of the 33d Street Intermediate Shaft, and supplied air for
driving the tunnels east and west from the Intermediate Shafts on both
32d and 33d Streets. Two compressors, the same as the large
Laidlaw-Dunn-Gordon machine at First Avenue, were installed here, with a
similar water-cooling tower.
Both shafts were on private property, owned by the Railroad Company, on
the north side of the streets, and each was equipped with two telphers
supported on timber trestles, similar to those at First Avenue.
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