(NOTE: The folowing is an excerpt from letter: sEN~137, dated 13 February 1952):
from D. T. Robbins, Chief Engineer, Hal, to Manager, A.E. Co, Albuquerque,
~~
ow
1
oo
ee
ee
ee
ee
"Greenhouse" coordinates
ee
ee
mee
we
mw
ee
we
we
me me
te
eee
N
ft
@
a Ivy"
2,307.86 EB 3,821.76
S465 20! ysis
co
5,051.77 E
“945 ..%3
147,390.40 E 83,523.60
Zero to Sta, 6A
6”
le,1637595 E 86,391.46.
a
6° dot 13"
Star
6A
Difference
Stae Zero
Location Ruby .
11,148.91 E
"Greenhouse" coordinates
170%39-90 E 6,311.49847.06 E 125,304.64
3;7153.21
132,055.50 E 110,146,00
"Ivy"
ms 58° 06! 5OmE
Zero to Sta. 6A
"Greenhouse" bearing
| tLyytt
1
ott
"
tion
Stas Zero
e.
W
N
15,058.71
E
“953 033
106,178.70 E 124,317.80
Zero to Sta. 6A
u
n
68
Difference
0
N
4H
11,947.10 B 3,426.89
103,067.64 E 262492 205
S 38° 2g' Seng
29'
338°
0° 00! 462- 58°
To determine the location of any structure based on the "Ivy" coordinate system,
coordinates of zero,
S
0° oof 23"
Difference
apply the difference in bearings between grids at the particular location to the
*Greenhouse® bearing. From the adjusted bearing and the given distance from zero
to a structure compute the difference in coordinates to be applied to the "Ivy"
mR
NM.) 7-
ee
Sta. 6A
Zero
' "Greenhouse" bearing
a
rye
ne
ee
=
"Ivy"
Ty
#
ee
Location Janet
"Greenhouse" coordinates
*“Iyvy"
"Greenhouse" bearing
.
le
The relation between local grids used for the "Greenhouse" computations and the
new Atoll grid is as follows. This is based on the difference in bearings of
the sero lines as computed from the two systems, and gives the relation of structure
6A to gero at each of the three locations,
Pacific Southwest Region
. Reproduced from the holdings of the National Archives
Be
ome ee
EN
“|
eS
—