[Illustration: STEAM ELEVATOR, AND DICKS'S PATENT TOP VENEERING PRESS.]
Having thus given a passing glance at most of the mechanical parts of the piano-forte, we will now examine the varnishing and polishing departments, consisting of some five or more large rooms. As the different layers of varnish require time to dry, it is policy to let the varnish harden while the workmen are busy putting in the various internal parts of the piano. Thus the case, when it comes from the case-maker, goes first to the first varnishing-room, and receives several coats of varnish; and, when the workman is ready to put in the sounding-board and iron frame, it is taken from the varnish-room to his department; and, when he has finished his work, it is again returned to the varnishing department, where it remains until the finisher wants it, who, when done with it, returns it to the varnishing-room. Thus, these varnishing-rooms are the store-rooms for not only the cases, but all the parts that are varnished; and the drying of the varnishing is going on all the time that the other work is progressing. In this establishment, from 150 to 200 pianos are being manufactured in the course of each day. In the varnish-rooms, from 100 to 150 cases are at all times to be seen; others are in the hands of the workmen in the different rooms, in the various stages of progress towards completion. Besides the cases in the varnish-rooms, we may see all the different parts of the pianos in dozens and hundreds, legs, lyres, tops, desks, bars, &c. &c., forming quite a museum in its way. The processes of varnishing and polishing are as follows: The cases, which are all of rosewood, are covered first with a spirit-varnish made with shellac gum, which, drying almost instantly, becomes hard, and keeps the gum or pitch of the rosewood from acting on the regular oil varnish. After the case has been "shellacked," it then receives its first "coat of varnish" and left to dry; and then a second coat is applied, and again it is left to dry. The varnish used is made of the hardest kind of copal gum, and prepared for this express purpose. It is called scraping varnish; it dries hard and brittle, and is intended to fill in the grain of the wood. When it becomes thoroughly dry and hard, these two coats are scraped off with a steel scraper. The case then receives several coats of another kind of varnish; when this is dried, it is ready for rubbing, which is effected by means of an article made of cloth fastened on blocks of wood or cork; and the varnish is rubbed on with ground pumice stone and water (a process somewhat similar to that of polishing marble). A large machine, driven by the engine, is used for rubbing the tops of pianos and other large surfaces. When the whole surface is perfectly smooth and even, it receives an additional coat of varnish. Each coat having become dry, hard, and firm, the surface receives another rubbing until it is perfectly smooth, when it receives a last flowing coat. After it is thoroughly dried and hardened, it is ready for the polishing process, which consists in first rubbing the surface with fine rotten stone, and then polishing with the fingers and hands until the whole surface is like a mirror wherein we can