Surveying
In the prismatic compass

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

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Surveying
Homologous points are

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

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Surveying
The length of a chain is measured from

outside of one handle to outside of other handle
inside of one handle to inside of other handle
centre of one handle to centre of other handle
outside of one handle to inside of other handle

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