But several operations we have purposely passed by, as it was our wish to give a clear idea of the structure of the piano-forte by exhibiting, from stage to stage, the progress of the manufacture of the musical machinery. Let us now look after the construction of the other parts of the instrument. The "leg-bodies," as they come from the machine, are cut out in shape in a rough state, ready for being veneered (or covered with a thin coating of rosewood or mahogany); and, as they are of various curved and crooked forms, it is a trade by itself to bend the veneers and apply them correctly. The veneers are curved and bent to the shapes required while hot, or over hot irons, and then applied to the leg-bodies by "calls," or blocks of wood cut out to exactly fit the surface to be veneered. These calls are heated in the steam ovens. The surface of the leg having been covered with glue, the veneer is put on, and then the hot call is applied and screwed to it by large handscrews holding the veneer closely and firmly to the surface to be covered. The call, by warming the glue, causes it to adhere to the legs and veneer; and, when cold and dry, holds the veneer firmly to its place, covering the surface of the leg entire, and giving it the appearance of solid rosewood, or of whatever wood is used for the purpose. Only one surface can be veneered at a time, and then the screws must remain on until it is cold or dry; and, as the legs have many distinct surfaces, they must be handled many times, and, of course, much labor is expended on them. After all the sides are veneered, they must be trimmed, scraped, and finished, and all imperfections in the wood made perfect, ready for being varnished.