Project Blue Book Archive

Page ID (PID)	MAXW-PBB2-820
Collection	NARA-Maxwell


Page 820 of 1352

Roll Description	Maxwell Blue Book 2
Document Code	N/A

MAXW-PBB2-818

MAXW-PBB2-819

MAXW-PBB2-820

MAXW-PBB2-821

MAXW-PBB2-822

	Page Scan	Page Text

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THIS  PAGE  IS UNCLASSIFIED
  
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THJS PAGE IS UNCLASSIFIED*
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METHOD''II.     Dlreot use of  Earth''s Lfcgnetio  Field.
\
One  obson        (jLnoident <jfc)   noticid  a  viole       notion.of a hard-hold
1                             ~*
compass.     If we assume  fron f|[^ t)iat  the  objeots produced a magnetic
field,  oomparable with, the  Earth''s  field,  namely 0.1  gauss,  and. that the
.                                                                                                                                                                                                                                                                                                                                  "i
observer   found that the  objeot  subtended an an^le  0 at his   position,  then
ths an pe re turns  of tha  required electromagnet   is  given by                |             ''
i
ni  ^z r      where  R  is the  range  of the  objeot.
For instance,   if R  is  one  kilometer and  the objeot  is   "Q.0 meters  in diameter.
then ni  1 billion efmpere-turns.
How if the object were  actually only  10 haters
L
away and were correspond-
ingly smaller,   namely 10 cm  in diameter,   it would still  require  10 million
ampere-turns.
These figures are a little   in exoeqs  df what can be  conveniently done
on the  ground.     They malce  it seem unliksly that the effect was actually
observed.        ''                                                     ''                 ''        ;            ,,
Row'' th  Barth''s magnetio rfiald would  react on suoh a magnet to produoe
not only a torque but also a  force.     This''for''oe depends not  directly on
gradient.    This
the Eiarth^B field intensity but on  its   irregularity, or
foroe  is  obviously minute   since the  change   in field over a distance  of
10. netera   (assumed diameter of the objeot)   is soaroely measurable - more-
over the gradient is not  prediotable but ohanges due to local ore deposits.
''Thus even if the effect; woro large enough to use it would still bo un-
-    .   I                                                                                               '';''
jrej.iablfi'' and unpredictable.        /        ;                  /                                            
^T ''                                                                /''     .-        ''                                ''
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Page 820 of 1352