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:
Ahrons Steam Locomotive Construction and Maintenance Fig. Radial drilling machine for boiler plates Original Steam Locomotive Construction and Maintenance Fig Scan Internet Archive archive org Ahrons PDoldauto PDold Scans from Ahrons Steam Locomotive Construction and Maintenance Drilling and threading Boiler construction