In the early 19th century, the number of hatters in the area began to increase, and a reputation for quality work was created. The London firm of Miller Christy bought out a local firm in 1826, a move described by Arrowsmith as a "watershed". By the latter part of the century hatting had changed from a manual to a mechanised process, and was one of Stockport's primary employers; the area, with nearby Denton, was the leading national centre. Support industries, such as blockmaking, trimmings, and leatherware, became established. Stockport Armoury was completed in 1862.