An Extract from The Birmingham Trades edited by G.P. Bevan (1876). This is, as shown below in a ten page article relating to "Locks". It basically relates how manufacture developed in the Wolverhampton area, and provides information about the early working conditions with details of the various types of locks that are still found today. The main point that seems to need comment is the reference at the bottom of page 52 that Barron's "stump on the tumbler" was "still adhered to" in 1876. The position was changed in 1818 when Chubb placed the stump on the bolt instead of the tumbler, and that indeed is a principle which has continued in modern locks.
