, the other was 16 by
10 by 18-in., rated at 630 cu. ft. They were fitted with 9-ft.
fly-wheels, and were driven at 150 rev. per min. by 105-h.p., General
Electric, 220-volt, compound-wound, direct-current motors running at 655
rev. per min. The larger of these two compressors was driven by two of
the motors belted in tandem, and the smaller was belt-connected to a
third motor. The compressors were water-jacketed and had small
inter-coolers, the water supply for which was itself cooled in a Wheeler
Condenser and Engineering Company's water-cooling tower. The pump and
the blower operating it were electrically driven.
The telphers, used for hoisting muck from the tunnels and for lowering
supplies, were each hung from single rails on a timber trestle, about
40 ft. high, spanning and connecting the two shafts. One machine was
provided for each shaft, and where their tracks crossed 33d Street they
were separated sufficiently to permit the machines to pass each other.
At this point, and covering the street, a large platform was provided,
on which the trucks were loaded and unloaded (Fig. 2, Plate LVIII), and
from which they descended by an incline on First Avenue leading south to
32d Street. The platform also covered practically all the yard at the
South Shaft and materially increased the available working area.
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