Uprights are pianos which the soundboard and plane of the strings run vertically, perpendicular to the keyboard, thus taking up less floor space than the normal grand piano. Upright pianos are made in various heights; the shortest are called spinets or consoles, and these are generally considered to have an inferior tone resulting from the shortness of their strings and their relatively small soundboards. The larger upright pianos were quite popular in the later 19th and early 20th centuries. The action (hammer and damper mechanism) of the upright differs from the grand-piano action mainly in that upright action is returned to a resting position by means of springs rather than by gravity alone, as in a grand. This, in part, accounts for the characteristic “touch” of uprights, which is distinct from that of grands. The chief advantages of upright pianos lie in their modest price and compactness; they are instruments for the home and school, not for the concert stage.
The majority of upright pianos have strings running upward from the bottom of the case, near the floor; this design is owed to John Isaac Hawkins, an Englishman who lived in the United States in about 1800 and became an important piano maker in Philadelphia. Earlier, the strings started upward from near the level of the keys; these instruments were necessarily much taller and lent themselves to various decorative designs, among them lyre-shaped; round; the “pyramid” model (Pyramidenflügel; 1745) of the Saxon organ-builder Ernst Christian Friderici, with both sides sloping upward to the flat top; and the “giraffe-style” design (Giraffenflügel; 1804) of Martin Seuffert of Vienna, with one side straight and one bent, as on a grand piano.
Many people these days seem to be interested in the industries heavily promoted “hybrid pianos" as an alternative to acoustic models.
Most of the instruments sold as hybrids are actually digital pianos with regular piano actions to get a closer to acoustic feel. The digital manufacturers have been improving the actions since day one to try to come as close to an acoustic experience while playing as possible, and this is the ultimate outcome.