CHAPTER Il, SECTION 3
15, and 16 lines of sight. This opening was closed
with a plywood wall, after the lines of sight had
been established. One large roll-up door on the
northwest side permitted entry of heavy equipment. A steel ladder provided access to the roof
for installation and adjustment of telemetering
and radio antennas. To speed the time of design
and procurementfor this structure, a cab identical with that of Station 24 in Operation REDWING was selected. Two concrete baffles were
located on the floor in the structure to collimate
and shield the various lines of sight. One baffle
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13% feet high, encompassed an arc of 120° in
the southeast end of the cab, providing 2 feet of
concrete and 5% feet of sand shielding. The
baffle was slotted to permit installation of a
414x3x2-foot iron shield and LASL-furnished
sand and paraffin shields. The second baffle was
placed on the line of sight to Station 1220.02;
it was 2 feet thick, 44%4 feet wide, and 6% feet
high.
Power to this station was provided by a
75-kva, 4160/120-208-volt, 3-phase transformer
located southeast of the station. Primary power
to this transformer was supplied through an oil
fuse cutout from the 4160-volt, 3-phase, 3-wire,
60-cycle island distribution system. This trans(Neg. No. W-V-240-10)
former also provided power to Stations 322.01,
1130, 1210.01, 1216, 1218, 1523.01-.04, 1527/
1611, 1612, and to five trailer receptacles. Power
Pipelines 1527, 1611 and
distribution for utility and scientific purposes
within Station 20 was made through an 18-
STATION:
20
SITE:
Yvonne
plied power through two 5-kva, 120/440-volt
dry-type transformers connected to the lighting
panel.
USER:
LASL
PURPOSE:
Zero Station
Figure No. 2-22.
1612 Leading into Station 20.
PARTICIPATION: 20
DESIGN PSI:
None
CONSTRUCTION: 1-4-58/4-25-58
Located at the north end of Site Yvonne,
this station was a 33-foot, 4-inch-wide by 35foot, 4-inch-long steel-framed building with black
corrugated protected metal roofing and siding.
The building consisted of three welded steel rigid
frames, with a double-pitched roof rising to the
ridge line at 30 feet 5 inches. Roofing andsiding
sheeting were supported on steel channel purlins
and girts. The foundation consisted of reinforced
concrete pedestal footings. The floor was a 6inch-thick reinforced concrete slab on the ground
with a combined, deepened footing section
around the perimeter. A 5-ton suspended monorail type girder crane was provided to operate
within the building length. Maximum clear hook
height was 21 feet.
A large opening in the southeast wall was
provided to permit entry of the Program 12, 13,
Page 70
circuit lighting panel. The bridge crane was sup-
Timing signals were provided by one 51pair cable terminating in a 53-pair terminal cab-
inet in the cab. This cabinet also furnished
signals for the telemetering antennas, Stations
81.20 and 83.20, located on the structure roof.
Three telephones were used in Station 20:
one line was connected to the Site Yvonne exchange; one line was connected to the Site Elmer
operator; and a direct line went to Station 71,
Site Elmer, for calibration of equipment. The
hot-line to Station 71 terminated at Station 20
through an EE-8 set with a headset on a Supervisor’s extension cord. Three field phone circuits
were used to align mirrors and pipes and tocalibrate instruments.
STATION:
21
SITE:
Gene
USER:
LASL
PURPOSE:
Zero Station
PARTICIPATION: 21
DESIGN PSI:
None
CONSTRUCTION: 12-31-57/4-17-58