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It is difficult to determine what metal the strings of Cristofori's pianos were made of, since strings are replaced as they break, and sometimes restorers even replace the entire set of strings.
According to Stewart Pollens, " the earlier museum records document that all three Cristofori pianos were discovered with similar gauges of iron wire through much of the compass, and brass in the bass.
" The New York instrument was restrung entirely in brass in 1970 ; Pollens reports that with this modification the instrument cannot be tuned closer than a minor third below pitch without breaking strings.
This may indicate that the original strings did indeed include iron ones ; however, the breakage might also be blamed on the massive rebuilding of this instrument, which changed its tonal range.

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