File:Staybolt Tap Smithsonian.png

Staybolt tap. This tool is part of a collection of hand tools used in the inspection and repair of steam locomotives in Salisbury, North Carolina from the early- to the mid-20th century, roughly 1900-1955. Light repairs on steam locomotives were usually done in roundhouses at the many small locomotive terminals. From https://www.si.edu/object/nmah_1212991