My GGG Grandfather was a pattern maker, in the early 1800s.

The making of patterns, called patternmaking (sometimes styled pattern-making or pattern making), is a skilled trade that is related to the trades of tool and die making and moldmaking, but also often incorporates elements of fine woodworking. Patternmakers (sometimes styled pattern-makers or pattern makers) learn their skills through apprenticeships and trade schools over many years of experience. Although an engineer may help to design the pattern, it is usually a patternmaker who executes the design.

I believe he moved from Devon to London to work on the development of London's railway system.

https://en.wikipedia.org/wiki/Pattern_(casting)