Here
electric conduits, pipe, castings, and other heavy and bulky supplies
were stored.
During excavation the headings were supplied with forced ventilation
through 12-in. and 14-in. No. 16, spiral-riveted, asphalted pressure
pipes, canvas extensions being used beyond the ends of the pipes. A No.
4 American Blower, located at the top of each shaft and driven by a
15-h.p. General Electric motor, supplied the air.
[Illustration: PLATE LVIII, FIG. 1.--VIEW OF FIRST AVENUE PLANT.]
[Illustration: PLATE LVIII, FIG. 2.--TELPHER STRUCTURE AND LOADING
PLATFORM, FIRST AVENUE SHAFT.]
[Illustration: PLATE LVIII, FIG. 3.--HEADWORKS AT 33D STREET:
INTERMEDIATE SHAFT.]
[Illustration: PLATE LVIII, FIG. 4.--LOADING SPOIL ON BARGES, 35TH
STREET PIER.]
A concrete-mixing plant was placed in each shaft, the mixer being
located high enough to discharge into cars at about the level of the
springing line of the arch. Above the mixers were the measuring
hoppers set in the floor of a platform which was large enough to carry
half a day's supply of cement. At the South Shaft the cement was
delivered to this floor from the loading platform through a spiral steel
chute; at the North Shaft it was lowered in buckets by the telpher. The
sand and stone were drawn into the hoppers through short chutes from the
base of the storage bins which occupied the remaining height of the
shaft--about 50 ft.
Pages:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25