Which preposition to use with paintress

at Occurrences 1%

And she had sat in the cab with the young woman, who was a paintress at Peel's great manufactory at Shawport, and suffered from a weak chest; and they had talked about the potters' strike which was then upheaving the district, and the cab had overtaken a procession of thinly clad potters, wending in the bitter mist to a mass meeting at Hanbridge; and Hilda had been thereby much impressed and angered against all employers.

Which preposition to use with  paintress