gad

A gad is an intermediate product of iron smelting, a semi-finished lump of wrought or pig iron that emerges from the blast furnace or bloomery in an unpurified state. It typically weighs between 80 and 120 pounds, though the exact mass varied by region, furnace type, and ore quality. The gad was not yet suitable for sale or use; it required further heating, working, and refining before it could be drawn into bar iron or incorporated into finished stock.

The term reflects the irregular, unrefined character of the product. A gad was essentially whatever the furnace produced in a single charge or withdrawal, shaped roughly into a portable lump by hand or simple hammering at the furnace mouth. This contrasts with the more precisely standardized bloom or pig iron bars that followed organized milling and reheating cycles. In some accounts, a gad was specifically the product of a single day's work or a single tapping, making it a unit of production convenience rather than specification.

Gadding, the process of consolidating and partially refining the gad into a more workable form, was a necessary intermediate step. The gad would be reheated to welding temperature, then worked under a hammer to expel slag, gas, and impurities. Multiple gads might be combined and worked together to achieve the density and homogeneity needed for further drawing or bending into useful shapes. This labor-intensive stage sat between primary smelting and the production of merchant bar iron.

The term is now archaic in modern steelmaking. Integrated mills and controlled casting processes have eliminated the need for gadding as a discrete production phase. When the word appears in historical texts or accounts of traditional iron working, it describes a crucial but unglamorous step in the transition from ore to metal, one that required skill and strength but attracted little formal documentation. Its vagueness across different ironworks and eras, and its eventual replacement by more precise industrial terminology, explains why gad survives mostly in technical history and antique trade records.