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Compass and Clinometer are Used to Survey Caves.

Credit: John Pint
article: Surveying and Mapping Caves 		Other images from this article
Cave Surveyor Using a Tape to Measure Distances. Compass and Clinometer are Used to Survey Caves. Data and Sketches Go into a Cave Survey Book. Cave Survey Data is Transferred to Graph Paper. A Good Survey Means an Accurate Cave Map.
Compass and Clinometer are Used to Survey Caves., John Pint