john cleves symmes
    camera-icon
  • Photo Credit: Wikimedia Commons
john cleves symmes
    camera-icon
  •  Illustration from "Symmes's Theory of Concentric Spheres": demonstrating that the Earth is hollow

    Photo Credit: Wikimedia Commons
john cleves symmes
    camera-icon
  • Symmes' Circular No. 1

    Photo Credit: Wikimedia Commons
Published on 4 Jan 2018