Solomon A. Jones & Co.
Bevels, Marking Gauges, Rules, Squares
See Willis Thrall & Son
Nelson, Robert E., Ed. (1999). Directory of American Toolmakers: A listing of identified makers of tools who worked in Canada and the United States before 1900. Early American Industries Association.
/PDFsforInventory/WebVaIRmachinists_PDF.pdf -- contains a listing of a trisquare possibly manufactured by S.A. Jones & Co.