'File 5/1 XIV Kuwait Oil Company' [‎48r] (100/570)

that uatw ulthoigii ~-r*•G.*iylrm st&toa
that nothin boaa chciii^U. lir.also states that
the oardwooc post desorlbed above uno aestroyed by one of the
a er van Is of the mission Portly sftor it vas sot out.
It is neither our intention nor cesire to make
ext**siv® observations, but llm roobserve the irngnitude azid
dire oil Oil of the earth's aa gift tic fisif at the same location
exactly that m s observed in iinrch li, IfeOW, and to
determine in what way and direction thi? field has varied.
he observation is ooaewhat conple^x as the
instrument sent u by the ^aruegie Institution is relatively
implex. The routine of the observation takes about three
or four hours <d th e little luck. Thua if nothing pets
wrot %, as it well may do with a relatively complex and
dclicata instruiaant, one should be able to complete the
observation in the course of ona day.
The obos.-vatiou co delete of the follow in*; stepa:
( 1 ) Le tar mi anti on or true north (axis of earth's rotation)
by observation eiUier of the pole star or the sun
with a transit.
( 2 ) Determination of i 4 fc$a&tic north (position of €m rths
oft gnat 1 c pole) so that deviation from true north
0 5 tfi be determined. True north was determined in
step U)»
(3) Determine tion of magnetic dip; i.e., ho* far a magnetic
needle deviates from the horizontal when it ia free to
rotate in a vertical plaift.
( 4 ) J)e termination of Magna tic dip with an earth inductor
oompafts (i^uah a» is used to determine direction on
'ifi? end Ii.perisl airways' planes) which is much more
sensitive and accurate than the dip needle.
( 5 ) Measurement of the etrength of the earths magnetic flelc
at the point of observation.
Dtopa 2,3, and 4 determine uniquely the direction
of the earth's magnetic field; step b determines the
strength.