^{530     5}Good,58.
⁵³¹Arthur Ord-Hume, “Zumpe, Johann Christoph,” In 2Palmieri, Encyclopedia of the Piano, 451.
⁵³² David Grover, A History of the Piano from 1709 to 1980 https://www.piano-tuners.org/history/d_grover.html (accessed 14th May 2015).
^{533     6}Good, 111
^{534     7} Good,211
^{535     8} Good, 200
⁵³⁶ The term ‘chromatic span’ is interpreted in this instance as being a group of 11 semi-tones, 7 whote-tones. Therefore the full chromatic spans consist of 8 repeats of each of the 11 semi-tones.
^{537     8} Peggy Flanagan-Baird, “KEYBOARDS,” in 3 Palmieri, Encyclopedia of the Piano, 203.