Today's upright, grand, and concert grand pianos attained their present forms by the end of the 19th century. Improvements have been made in manufacturing processes, and many individual details of the instrument continue to receive attention
Grand pianos have the frame and strings placed horizontally, with the strings extending away from the keyboard. This makes the grand piano a large instrument, for which the ideal setting is a spacious room with high ceilings for proper resonance. There are several sizes of grand piano. Manufacturers and models vary, but a rough generalisation distinguishes the "concert grand", (between about 2.2 m to 3 m long) from the "boudoir grand" (about 1.7 m to 2.2 m) and the smaller "baby grand" (which may be shorter than it is wide). All else being equal, longer pianos have better sound and lower inharmonicity of the strings. This is partly because the strings will be tuned closer to equal temperament in relation to the standard pitch with less stretching (See: Piano tuning). Full-size grands are usually used for public concerts, whereas baby grands are often chosen for domestic use where space and cost are considerations.
In the first part of this era, technological progress owed much to the English firm of Broadwood, which already had a strong reputation for the splendour and powerful tone of its harpsichords. Over time, the Broadwood instruments grew progressively larger, louder, and more robustly constructed. The Broadwood firm, which sent pianos to both Haydn and Beethoven, was the first to build pianos with a range of more than five octaves: five octaves and a fifth during the 1790s, six octaves by 1810 (in time for Beethoven to use the extra notes in his later works), and seven octaves by 1820. The Viennese makers followed these trends. The two schools, however, used different piano actions: the Broadwood one more robust, the Viennese more sensitive.
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