Turpentine Collection - In this case a spiral gutter and apron were used in raising the cup on the bark-chipped and acid-treated face. When clay cups are used a double spiral gutter is recommended - Note round face - No wood has been cut - Bark is only peeled.
Creative Commons License
This work is licensed under a Creative Commons Attribution-No Derivative Works 4.0 License.
usfs, nfgt, cultural resources, national forests and grasslands in texas, united states forest service, historic photo, historic image
Tell us how this article helped you.