https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/14015528
Pierre-Louis Moreau de Maupertuis pointing out the length of a degree on the longitude of meridian in Lapland to two people. Etching, 1753.
Original public domain image from Wellcome Collection
Public DomainFree CC0 image for Personal and Business use