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Also, the azimuth of the line North Base-Sand
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uced fromtheholdings0!f the Nationa
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Base as established by this survey.
ENGINEERS
The JOINT TASK FORCE. SEVEN SURVEY made in 1947-48 and covering the eastern
portion of the lagoon from Aniyaanii to Engebi, consisted of a limited scheme with
stations on Engebi, Aoman, Runit and Aniyaanii and station Coral in the lagoon.
The scheme was stated to be of first order accuracy and first order procedure
was used.
However, the base expansion figure was not consistant with specifications
of the U.S, Coast anc Geodetic Survey and it wan only because of the limited extent
of the scheme that it could be eonsidered of a high order of accuracy.
Of the seven stations included in this survey, station Graflex on Aoman Island
had been destroyed and the station on Aniyaanii was of little value in expanding
the scheme,
To establish a new station on Aoman for the present survey required
reoccupying three of the five remaining stations.
It thus was apparent that the
expanded requirements of the present survey involved re-establishment of a complete
triangulation network,
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Station South Base of the U.5.S. Bowditch Survey was not recovered anc a new
station "Runit" was established at the south end of the island,
The line North
Base-Runit became the base line of this survey.
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The geographieal position of station Nerth Base and the azimuth of the line
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North Base-Sand as established by the U.5.S. Bowditch Survey were accepted and a 2 cD .
became the origin of position and asimuth, Although the original azimith obser-
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vations were made from station North Base to station South Base an examination of - -
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the corrections obtained for the angle in the U.S.S. Bowditch triengulations showed
that but little accuracy rould be lost by accepting the azimuth of the Jine from
station North Base to station Sand «s the basis of azimuths for the survey.
There-
fore it wes considered that reobservation for azimuth was not justified.
The line North Base-Runit was measured to first order accuracy and the azimith
" . “ire eee computed from its relation to the line N\. Base~Sani.
‘tars involved in establishing the azimuth of this new base line
fom or. Peroree purroges,
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