It was worked by the revolutions of the water-wheel, furnished with projecting arms or knobs to raise the hammer, which fell as each knob passed, the rapidity of its action of course depending on the velocity with which the water-wheel revolved.

The forge-blast was also worked for the most part by water-power.

Where the furnaces were small, the blast was produced by leather bellows worked by hand, or by a horse walking in a gin.

The foot-blasts of the earlier iron-smelters were so imperfect that but a small proportion of the ore was reduced, so that the iron-makers of later times, more particularly in the Forest of Dean, instead of digging for ironstone, resorted to the beds of ancient scoriae for their principal supply of the mineral.
Notwithstanding the large number of furnaces in blast throughout the county of Sussex at the period we refer to, their produce was comparatively small, and must not be measured by the enormous produce of modern iron-works; for while an iron-furnace of the present day will easily turn out 150 tons of pig per week, the best of the older furnaces did not produce more than from three to four tons.

One of the last extensive contracts executed in Sussex was the casting of the iron rails which enclose St.