The tall vertically strung upright grand was arranged with the soundboard and bridges perpendicular to keys, and above them so that the strings did not extend to the floor. Diagonally strung Giraffe, pyramid and lyre pianos employed this principle in more evocatively shaped cases. The term was later revived by many manufacturers for advertising purposes.
The very tall cabinet piano introduced by Southwell in 1806 and built through the 1840s had strings arranged vertically on a continuous frame with bridges extended nearly to the floor, behind the keyboard and very large sticker action.
Although there were various crude earlier attempts to make stringed keyboard instruments with struck strings,[1] it is widely considered that the piano was invented by a single individual: Bartolomeo Cristofori of Padua, Italy. It is not known exactly when Cristofori first built a piano, but an inventory made by his employers, the Medici family, indicates the existence of a piano by the year 1700. The three Cristofori pianos that survive today date from the 1720s.
The plate, or metal frame, of a piano is usually made of cast iron. It is advantageous for the plate to be quite massive. Since the strings are attached to the plate at one end, any vibrations transmitted to the plate will result in loss of energy to the desired (efficient) channel of sound transmission, namely the bridge and the soundboard. Some manufacturers now use cast steel in their plates, for greater strength. The casting of the plate is a delicate art, since the dimensions are crucial and the iron shrinks by about one percent during cooling. The inclusion in a piano of an extremely large piece of metal is potentially an aesthetic handicap. Piano makers overcome this handicap by polishing, painting, and decorating the plate; often plates include the manufacturer's ornamental medallion and can be strikingly attractive. In an effort to make pianos lighter, Alcoa worked with Winter and Company piano manufactuers to make pianos using an aluminum plate during the 1940s. The use of aluminum for piano plates, however, did not become widely accepted and was discontinued.
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