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A dip circle is at right angles to the m...

A dip circle is at right angles to the magnetic meridian. What will be the apparent dip ?

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When the plane of the compass of dip circle is exactly perpendicular to the magnetic meridian for that point, then the horizontal component of the field cannot affect the needle so it gets aligned along vertical component. Hence the angle between planes of the compass and the magnetic meridians is `90^@` .
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The value of dip at a place is 45^@ . The plane of the dip circle is turned through 60^@ from the magnetic meridian. Find the apparent value of dip.

The true value of dip at a place is 30^(@) . The vertical plane carrying the needle is turned through 45^(@) from the magnetic meridian . Calculate the apparent value of dip .

The dip at a place is delta. For measuring it, the axis of the dip needle is perpendicular to the magnetic meridian. If the axis of the dip needle makes angle theta with the magnetic meridian, the apparent dip will be given tan delta_(1) which is equal to:

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