Old pipes in Mammoth Cave
Detailed Description
Wooden pipes inside Mammoth Cave date from 1812, when the cave was mined for saltpeter (Potassium Nitrate) which was used to make gunpowder.
Sources/Usage
Public Domain.
Wooden pipes inside Mammoth Cave date from 1812, when the cave was mined for saltpeter (Potassium Nitrate) which was used to make gunpowder.
Public Domain.