Surveying
A telescope is said to be inverted if its

vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is down

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Surveying
Homologous points are

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

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