352 
Hawaii Inst, of Geophysics 
Fig. 2. Local gravity base interconnections, Hono- 
lulu, Hawaii. 
New Inter-Island Terminal. On concrete side- 
walk next to third rock column from Aloha 
Airlines or fourth rock column from Ha- 
waiian Airlines. 
21°20.2'N 
157°55.5 , W lift 978.9330 gal 
Hawaii Institute of Geophysics (University of 
Hawaii campus). Primary site: in center of 
flush ( floor ) pier in basement vault at south- 
west end of Institute of Geophysics building. 
17°30.6'N 
157°49.2'W 61 ft 978.9593 gal 
Secondary site: on concrete walkway about 1 
ft left of doorway leading into Room 108 
(when facing door), and about 2 ft to the 
right of a large stone pillar. 
17°30.6'N 
157°49.2'W 72 ft 978.9589 gal 
DETAILS OF SURVEY 
The gravity station observations on Oahu 
were taken with Worden gravimeter No. 607 
and Worden gravimeter No. 366. Most of the 
stations were taken along public streets and 
PACIFIC SCIENCE, Vol. XIX, July 1965 
roads, using automobile transportation. Most of 
the mountain stations were taken at helicopter 
pads, using helicopter support provided by the 
Kaneohe Marine Corps Air Station. Certain 
mountain stations, however, were taken during 
an overnight foot traverse into the Koolau 
Range. Except for the foot traverse, readings 
for drift control were taken at the base station 
at the beginning and end of each day’s work. 
If possible, reoccupations were made at inter- 
mediate times to improve drift control. For the 
foot traverse the base station tie was made 36 
hours after the initial reading. However, over- 
night drifts were removed by reoccupations and 
the base tie was used only to remove running 
drift. Daily drift was normally less than 0.5 
mgal per day and, judging from readings taken 
on the days when intermediate reoccupations 
were made, assumption of linear drift over an 
entire day’s work seldom produced errors in 
excess of 0.1 mgal. Elevations were taken from 
U. S. Geological Survey iVl quadrangle maps, 
by reference to sea level along the coast, or, in 
those cases where bench marks existed, at U. S. 
Coast and Geodetic Survey bench marks. The 
accuracy of the elevations is variable. Eleva- 
tions for stations taken at bench marks or at 
points where useful elevations were given on 
the maps are probably accurate to within 1-2 ft. 
Most of the other elevations for stations lying 
along public streets and roads are accurate to 
10 ft or better. For a few stations greater eleva- 
tion errors are possible. Elevation errors of up 
to 20 ft are possible for those stations estab- 
lished by helicopter in areas of the Koolau and 
Waianae ranges, and elevations for stations es- 
tablished on the overnight foot traverse could 
be in error by as much as 50 ft. All latitudes 
and longitudes were taken from the IV2 quad- 
rangle maps and are generally accurate to within 
0.T or better. 
REDUCTION OF DATA 
Normal data-reduction procedures were car- 
ried out for the data, with corrections made for 
drift and earth tides. The meter constant for 
meter No. 607 was 0.11457 mgal per scale 
unit and that for meter No. 366 was 0.050637 
mgal per scale unit. Comparisons of these me- 
ters against the pendulum stations of the west- 
