Surveying
In the prismatic compass

the magnetic needle moves with the box
the magnetic needle and graduated circle do not move with the box
the graduated circle is fixed to the box and the magnetic needle always remains in the N-S direction
the line of the sight does not move with the box

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Surveying
Homologous points are

Corresponding points on the ground and photograph
Opposite corners of a photograph
Plumb points of stereo pair of photographs
Nodal points of the camera lens

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