Image: Big bone cave saltpeter vat
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Description: Civil-war era saltpeter vat in Big Bone Cave, TN. On the right is some of the log piping used to carry water in and out of the cave for leaching the nitrates from the cave soil.
Title: Big bone cave saltpeter vat
Credit: Own work
Author: Dave Bunnell
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: https://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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