Surveying
A telescope is said to be inverted if its

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

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Surveying
The length of a chain is measured from

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

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