https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13986492
Measuring devices and diagrams based on the measurements of a mine. Etching by Bénard after L.J. Goussier.
Measuring devices and diagrams based on the measurements of a mine. Etching by Bénard after L.J. Goussier.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use