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.
Bessemer converter. Bessemer converter Image from Discoveries Inventions of the Nineteenth Century by Routledge published source en Image Bessemer converter PDold Drawings of Bessemer converters
Page 2023 Free-images.com. All images are Public Domain