Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,374 pages of information and 233,850 images on early companies, their products and the people who designed and built them.
F. W. Portass, 83a Sellers Street, Sheffield.
See also Portass Lathe and Machine Tool Co of Sheffield, who may or may not have been connected.
Makers of machine tools including the cheap model maker's 'Adept' lathe.