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4. THE ARRANGEMENT OF UNITS IN A TWO-STATION, THREE- 
COMPONENT DC DETECTOR, AMPLIFIER AND RECORDER SYSTEM. 
THE THREE COMPONENTS X, Y, Z, SPECIFY THE CONVENTIONAL 
ORTHOGONAL COMPONENTS ARRAYED ON GEOGRAPHIC AXES. 
X, AND Xp WERE SEPARATED IN DISTANCE BY 30 MILES. 
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6 CHANNEL 
PAPER 
RECORDER 
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