Formerly the workman who made household utensils out of tin was called a tinsmith. Nowadays the use of tin for this purpose has greatly decreased, and aluminum and enamel ware has taken its place to a large extent. Today the man who works on sheet tin, galvanized tin, sheet brass, and copper is called a sheet-metal worker.

Sheet-metal work consists in the utilization of sheets of metal for industrial purposes and comprises the laying out of tin or other sheet-metal utensils, the forming and making of waterspouts, the bending of lock joints by the use of the folder or brake (a machine for bending metal - Fig. 205), the laying of tin on roofs, and the closing of joints by the use of mallet seamers, or roofing tongs. The tinsmith or sheet-metal worker erects metal ceilings and side-walls, makes crestings, awnings, hollow circular moldings, metal sash-frames and skylights, and covers fire-doors and windows.

Sometimes a distinction is made between coppersmiths and sheet-metal workers. The coppersmith makes copper forms by hammering and then brazing (a form of soldering) the plate into the desired shape, while the sheet-metal worker makes a form by developing it from the sheet.

Fig. 205.   Bending Roll.

Fig. 205. - Bending Roll.