Surveying
The correction for sag is

always subtractive
sometimes additive and sometimes subtractive
always zero
always additive

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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 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

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