ewes"
AEDT
wages
7a
gf
AA oF ae
‘>
Coane
ave
™.= ~
eee
". —— ion Gk
Tee
9" eho
A scheme of first-order triencul*t::1 comnosed of check figures
was executed along the erstern side of the ctoll from a first-order
bese line on Runit Isl’nd.
This scheme extends northward to Engebi
Island end southwerd to Aniyaanii Isl: nd, «nd wes executed for the
the purpose of coordinrting locel surveys on tne activ-ted islends
and to establish distences cnd szimuths tetween certain instellations.
All observations were mede -t nivht, end standrrd procedure was
followed throughout.
The maximum tricnele closure for the entire
scheme wes 0°.41 seconds «nd tne sversge °1,.01 seconds.
“whe meximum
triengle closure in the base exrernsiv-n * ~ire was 01.10 seconds and
the average 00.55 seconds.
With the exeeption of stetion R'ET 1tHOW TOR, whick could not
be occupied becsuse of excessive vibreticn, cll stetlons vere occupied.
Treverse ties were msde to the Zero «nd/cr Pnoto tovers on Engebdi,
Aomon, Runit, end Aniyasnii isl: nds.
In order to coordin: te the tri nsulttion of the U.S.S. BOWDITCH
with the new survey, stations NCRTH bASE (>), 7id ond SAND USN, 1944
were incornorrted int: the scheme.
BASE LINk
A first-order bese Line wes mevsure
on Runit Islend between
stations NORTH BASE USN, 1944 cnd nevly «stebiished station RUNIT.
The confiruration of the islend neceéssit ted the edovtion of a broken
bese consisting of four sections of vrrying leneths. First-order
jnver teves were used, end strnderd -rocedure follored throuchout.
The cancuted probable error of “he
in 2,100,000.
This brse line is snorter then the
t+] memsurement is 1 nart
»«conceorder bese line measured
on the same islamd Dy wh U.S.S, Bo DITO" in 1944 due to the fact
thet a considerabie portion of tre gemil
end .of the
islend hvsp ww shea
cv
4
extending off the south
ewry.
ed
The bese ext Icion *ivure wes devel: es chrough stetion CORAL,
a newly estrblished st’ tian consiric'+
‘he seme gener:l trea es
stetion REEF Usl, 2:44, but not iden:icvel «.th thet strtion. This is
the most @dvanw ve: us
position
suiteble for observeticus «(gs
0)
Reproduced from the holdings of the National Archives
Pacific Southwest Region
TRIANGULATION
«t wh eh
Fer srt le
The base exps).sion figure does 1>t
first-order trisnyuletion in th't
1s generslly © lowed
respect in whieh the
tions,
co:
«cet
construction of a stetion
the stecifications for
the 2, for the firure is lereer then
on first orcer tri:n-ule tion, this is the only
triengul: tion f: i's to meet first-order specifice-
«nd is ASPPDLEBiaales
Hee._piitec extent of the scheme.
Pe tay
PN Me oF,etyt:
. SS at
:
t
_"
ae
gtsSed
wakept
ae
ae
oes
woe
.
nett!fers) yaa oe re AM cia
Page 1