At a place the angle of dip is 30° when dip circle is in geographical meridian and the dip angle is 45° when dip circle is in a plane perpendicular to geographical meridian. The dip angle in magnetic meridian is

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Q. When plane of dip circle is in magnetic meridian it shows dip angle 30, if plane of dip circle is turned by 30, the new dip angle is

Q. The plane of a dip circle is set in the geographic meridian and the apparent dip is

δ_{1}

. It is then set in a vertical plane perpendicular to the geographic meridian. The apparent dip angle is

δ_{2}

. Then declination

θ

at the place is

A dip circle is so set that the dip needle moves freely in the magnetic meridian. In this position the angle of dip is $39^{\circ}$ . Now the dip circle is rotated so that the plane in which the needle moves, makes an angle of $30^{\circ}$ with the magnetic meridian. In this position, the needle will dip by an angle :

Q. If a dip circle is placed in a vertical plane at an angle of

30^{o -}

to the magnetic meridian, the dip needle makes an angle of

45^{o -}

with the horizontal. The real dip at that place is?

Q. Dip circle is not set into magnetic meridian and the angle at which it is inclined to the magnetic meridian is unknown.

δ^{'}

and

δ^{''}

are apparent dips at a place in which dip circle is kept in transverse positions. The dip is:

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