This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Terrella. en William Gilbert's terrella from Practical Physics pub en Macmillan and Company en sl Slika Terrella PDold original upload log page en Terrella Caltrop bytes no Gilbert's terrella from Practical Physics Macmillan Scientific equipment
Page 2023 Free-images.com. All images are Public Domain