Original sentence: In 1824 Graf delivered to Ludwig van Beethoven a 6.5-octave piano triple-strung to C#, and quadruple-strung from D to the top (F4)—possibly on the assumption that this stringing would make the piano more audible for the composer, who was quite deaf by this time.The early 19th century was a period of ferment in the field of piano building; Wythe describes the work of contemporary builders as "a volatile blend of traditional craftsmanship and new technology, carried out in an atmosphere
Edited sentence: As Wythe says, "Graf's style appears to have emerged fully developed out of an apprenticeship with an obscure provincial maker.In 1824 Graf delivered to Ludwig van Beethoven a 6 1/2-octave piano triple-strung to C#, and quadruple-strung from D to the top (F4) -- possibly on the assumption that this stringing would make the piano more audible for the composer, who was quite deaf by this time.It is not known how Graf developed his style or methods for building pianos.None of the pianos of his teacher Schelkle survive, and the surviving early Graf instruments are not much different from his fully mature ones.The early 19th century was a period of ferment in piano building; Wythe describes the work of contemporary builders as "a volatile blend of traditional craftsmanship and new technology, carried out in an atmosphere