Skiopticon image from the Department of Photography at the Royal Institute of Technology. Use by Professor Helmer Bäckström as lecture material. Bäckström was Sweden's first professor in photography at the Royal Institute of Technology in Stockholm on a 10 mm welding joint, upper image with X-rays (120 kV), lower image with? more info See: Bäckström, Helmer. Photographic manual. Nature and Culture. Stockholm. 1942. p. 878.

---

Size: 1964px × 2545px
Photo credit: © BTEU/TEKNISKA / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: