Surveying
In a truly vertical photograph,

Plumb point coincides the principal point
All listed here
Principal point coincides the isocenter
Iso-centre coincides the plumb point

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Surveying
The length of a chain is measured from

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

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