Turning point

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1. In surveying, a hub used on hilly terrain to allow the surveyor's instrument to be moved to another location, where a new height of the instrument (HI) can be established to allow surveying to continue.


clark4.jpg

This is a man taking a survey of an area with very steep terrain, he is using a turning point device to more easily complete the survey.

"Source: http://www2.nature.nps.gov/parksci/vol19/vol19(2)/14-2clark.htm"