Handwriting decipher thread *must post link to full page*

Technichally a rigger works with plain steel wires and cables - joining (splicing ), adding ferrules, etc. They often work at heights e.g. the ESB guys working on High Tension pylons & cables. It's highly specialised work. (A 'linesman' is different, he strung wires, mainly telephone, from pole to pole.) ConEd was and remains the big power company for NYC and has a major plant on the East River/Manhattan. The word in brackets is 'valves' so his work would be attaching steel cables to valves/heavy metal plates to enable a hoist / crane lift them for repairsor servicing.

It's highly skilled manual labour and would have been much better paid than book-keeping.

There’s a baptism for John Webster, born 27/04/1863 to Robert Webster and Cecily Carty in Ferns, Wexford.
Edit: just saw this info was already in another post, apologies.

Not getting you wrong atall, , just hate to see you 'stumped' ☺️. To me the job description is 'qualified' by a specific role, i.e.valve, just as one often sees 'porter (meat)' or 'porter (railway)' or 'servant (indoor)' or 'servant (outdoor)'.