Welch and Griffiths turned their attention to the
manufacture of circular saws, and, in the face of many
obstacles, succeeded in establishing a national
reputation for their goods, although their failure had
been predicted. From time to time the firm
made many improvements in methods of manufacture,
especially in the mode of grinding both surfaces of a
saw at once.
The Memorial History of Boston,
Including Suffolk County,
Massachusetts, 1630 — 1880.
Justin Winsor, Librarian of Harvard University.