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.
Keywords from Image Description:
Clarke Chapman vertical boiler Rankin Kennedy Modern Engines Vol VI. Tyne vertical boiler by Clarke Chapman The watertubes within the second combustion chamber are mixture of around four large diagonal tubes flanked by smaller banks of narrower vertical tubes Vertical boilers Firetube boilers Clarke Chapman boilers Vertical crosstube