STRATEGIC IMPORTANCE OF GRAVIMETERS RE = EXPORT LICENCE B-7-917-33821

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP61-00391R000100330006-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 9
• Document Creation Date: November 9, 2016
• Document Release Date: July 13, 1998
• Sequence Number: 6
• Content Type: REPORT

Sanitized - Approved For Release : CIA-RDP6'1-00391 R000100330006-8
Subjects Strategic importance o, ;ravim+eters
licence B-''9l7-3332.
Gravimeters or jravity meterg are one type of instrument used to
h,.rMtive, variation in tae acceleration of gravity on the aaith
as a1?o,the distinctive chpracter of being usable for the measarc
Pm P!int .t- ,O, The other ?equentlyused instrument is the penlum.,..:
of absolute value of gravity at afiy giver. point. Each t;-pe of instrument
enjoys certain distinctiv,? advantages. The pendulum yields observations
uniform, 'Jt are obtainable at the cost of
K
(1)
ater tine required for ob exvation and (2) difficulties in poftabfi.?,rr
ch measur0s sensitive variations in gravity by means
of a delete Spring yields data tzat (1) can be observed in a fraction
ndulww, and (2) can be transported easily from
tal orror$ .due chiefly to flanges in pressure,, temperature and Shaer
a on th delicate sprin ,. 'he se errors are generally i e feared
point to point. Gravimetric obseations, however,, are subject to
to as the "drS.ft." The drift varsi, s not only amon
different in
t
g
s
rur+aex
I I
a degree .of non-unifoi$ty in data which necessitates (1) :?e:cent
calibration between instruments an o, (2) frequent returnin, of a gravi titer
from a maven field station on a aufvey to a `.lase station for which a bb use
Sanitized - Approved For Release : CIA-RDP61-00391 R000100330006-8
but also for given i.ttstrwaent -rom ci a Eet of conditions to as~c lrc r.. : hi
 value has been Ostab34shed by nui,crous pendulum observations. This
trouble o drift probler, has put a premium on technologists to develop an
rose drift rate woul4 be t a r