Classical guitar making (English Wikipedia)

Die Theorie der harmonischen Abstimmung der Resonanzplatten bei der Geige ... (1907) by Max Grossmann (Grossmann's text should not be interpreted as the only way to do plate tuning. They simply represent Grossmann's own theories—which were used by luthier Otto Seifert^{[permanent dead link]} from c. 1904 - c. 1914)

nicole-oresme.com

Nicole Oresme

ning.com

earlyguitar.ning.com

Examples of ladder-bracing:
1828 Lacote, A. Stauffer & Comp., ca. 1825, Lavigne, Paris circa 1815, (Pons-style Y-Bracing) (ref)
Fabricatore
Stauffer guitar from about 1836 (ref)
Early 6-string guitar from about 1780: 1 Archived 16 July 2011 at the Wayback Machine, 2 Archived 16 July 2011 at the Wayback Machine, 3 Archived 16 July 2011 at the Wayback Machine, 4 Archived 16 July 2011 at the Wayback Machine, 5 Archived 16 July 2011 at the Wayback Machine (ref Archived 16 July 2011 at the Wayback Machine)
Nicolas Bonafon around 1840 (ref)

nytimes.com

see last 4 paragraphs: A Violin's Value, and What to Pay the I.R.S. Fiddler by Richard Lezin Jones; 2 May 2004; New York Times
A Strad? Violinists Can't Tell

oldromanticguitars.blogspot.com

Examples of ladder-bracing:
1828 Lacote, A. Stauffer & Comp., ca. 1825, Lavigne, Paris circa 1815, (Pons-style Y-Bracing) (ref)
Fabricatore
Stauffer guitar from about 1836 (ref)
Early 6-string guitar from about 1780: 1 Archived 16 July 2011 at the Wayback Machine, 2 Archived 16 July 2011 at the Wayback Machine, 3 Archived 16 July 2011 at the Wayback Machine, 4 Archived 16 July 2011 at the Wayback Machine, 5 Archived 16 July 2011 at the Wayback Machine (ref Archived 16 July 2011 at the Wayback Machine)
Nicolas Bonafon around 1840 (ref)

oldtimeherald.org

Ladder-braced Guitars and the Enduring Mysteries of the Old-Time Sound by Dan Margolies

patents.google.com

sabionari.com

The Sabionari Guitar, made in Cremona in 1679

stenzel-guitars.de

Traditional versus modern construction of soundboards Archived 19 July 2011 at the Wayback Machine by Sebastian Stenzel Archived 19 July 2011 at the Wayback Machine

studia-instrumentorum.de

Louis Panormo, "Enharmonic Guitar", London 1829

tabulatura.com

Jost Amman: Der Lautenmacher - The Lute Maker by Kenneth Sparr

tecla.com

Fernando Sor. "Méthode pour la Guitare". Tecla. Archived from the original on 7 April 2010.
Fernando Sor notes: "This skillfull artist [Lacote] is very frequently obliged to satisfy those who consider the instrument otherwise than I do, and make guitars on which it is impossible to play my music or any other that has the base and other parts of the harmony always proceeding correctly; but let a good instrument be ordered of him, leaving him at liberty to make it as he pleases, he will make one for me [...]" (Fernando Sor. "Méthode pour la Guitare" Archived 7 April 2010 at the Wayback Machine. Tecla.)

telegraph.co.uk

Debunking the Stradivarius myth by Geoffrey Norris; 10 February 2005; The Telegraph

thamesclassicalguitars.com

Examples of ladder-bracing:
1828 Lacote, A. Stauffer & Comp., ca. 1825, Lavigne, Paris circa 1815, (Pons-style Y-Bracing) (ref)
Fabricatore
Stauffer guitar from about 1836 (ref)
Early 6-string guitar from about 1780: 1 Archived 16 July 2011 at the Wayback Machine, 2 Archived 16 July 2011 at the Wayback Machine, 3 Archived 16 July 2011 at the Wayback Machine, 4 Archived 16 July 2011 at the Wayback Machine, 5 Archived 16 July 2011 at the Wayback Machine (ref Archived 16 July 2011 at the Wayback Machine)
Nicolas Bonafon around 1840 (ref)

thewholeguitarist.com

[1], John Williams.

tufts.edu

Modes, Overtones and Harmonics Archived 4 November 2009 at the Wayback Machine - Chapter 3 from The Physics of Music and Musical Instruments Archived 8 January 2010 at the Wayback Machine by David Lapp

u-strasbg.fr

imgbase-scd-ulp.u-strasbg.fr

Athanasius Kircher: Page 477 Archived 21 July 2011 at the Wayback Machine (alternative) from Musurgia universalis sive ars magna consoni et dissoni - Tome 1 Archived 9 February 2008 at the Wayback Machine Athanasius Kircher (1602–1680)

num-scd-ulp.u-strasbg.fr

Athanasius Kircher: Page 477 Archived 21 July 2011 at the Wayback Machine (alternative) from Musurgia universalis sive ars magna consoni et dissoni - Tome 1 Archived 9 February 2008 at the Wayback Machine Athanasius Kircher (1602–1680)

uakron.edu

www3.uakron.edu

Examples of ladder-bracing:
1828 Lacote, A. Stauffer & Comp., ca. 1825, Lavigne, Paris circa 1815, (Pons-style Y-Bracing) (ref)
Fabricatore
Stauffer guitar from about 1836 (ref)
Early 6-string guitar from about 1780: 1 Archived 16 July 2011 at the Wayback Machine, 2 Archived 16 July 2011 at the Wayback Machine, 3 Archived 16 July 2011 at the Wayback Machine, 4 Archived 16 July 2011 at the Wayback Machine, 5 Archived 16 July 2011 at the Wayback Machine (ref Archived 16 July 2011 at the Wayback Machine)
Nicolas Bonafon around 1840 (ref)

usd.edu

orgs.usd.edu

The Rawlins Stradivari Guitar, 1700 (National Music Museum; University of South Dakota)

web.archive.org

Cité de la Musique: Les guitares classiques du Musée de la musique (almost 200 classical guitars) Archived 13 March 2010 at the Wayback Machine; Catalog: Instruments et oeuvres d'art Archived 25 July 2009 at the Wayback Machine - use search-phrase: Mot-clé(s) : guitare
"Ervin Somogyi: The State of the Contemporary Guitar". Archived from the original on 18 February 2010. Retrieved 5 February 2010.
Fernando Sor. "Méthode pour la Guitare". Tecla. Archived from the original on 7 April 2010.
"Per Hallgren". Archived from the original on 17 August 2011. Retrieved 4 February 2011.
Modes, Overtones and Harmonics Archived 4 November 2009 at the Wayback Machine - Chapter 3 from The Physics of Music and Musical Instruments Archived 8 January 2010 at the Wayback Machine by David Lapp
Examples of ladder-bracing:
1828 Lacote, A. Stauffer & Comp., ca. 1825, Lavigne, Paris circa 1815, (Pons-style Y-Bracing) (ref)
Fabricatore
Stauffer guitar from about 1836 (ref)
Early 6-string guitar from about 1780: 1 Archived 16 July 2011 at the Wayback Machine, 2 Archived 16 July 2011 at the Wayback Machine, 3 Archived 16 July 2011 at the Wayback Machine, 4 Archived 16 July 2011 at the Wayback Machine, 5 Archived 16 July 2011 at the Wayback Machine (ref Archived 16 July 2011 at the Wayback Machine)
Nicolas Bonafon around 1840 (ref)
"Adjustable microtonal guitar" Archived 21 July 2011 at the Wayback Machine by Tolgahan Cogulu
Traditional versus modern construction of soundboards Archived 19 July 2011 at the Wayback Machine by Sebastian Stenzel Archived 19 July 2011 at the Wayback Machine
"William R. Cumpiano on "Tap Tuning"". Archived from the original on 4 January 2010. Retrieved 30 December 2009.
Athanasius Kircher: Page 477 Archived 21 July 2011 at the Wayback Machine (alternative) from Musurgia universalis sive ars magna consoni et dissoni - Tome 1 Archived 9 February 2008 at the Wayback Machine Athanasius Kircher (1602–1680)
Interview with Keith Hill Archived 29 October 2009 at the Wayback Machine; original: Building Sound at 3 Quarks Daily
Fernando Sor notes: "This skillfull artist [Lacote] is very frequently obliged to satisfy those who consider the instrument otherwise than I do, and make guitars on which it is impossible to play my music or any other that has the base and other parts of the harmony always proceeding correctly; but let a good instrument be ordered of him, leaving him at liberty to make it as he pleases, he will make one for me [...]" (Fernando Sor. "Méthode pour la Guitare" Archived 7 April 2010 at the Wayback Machine. Tecla.)
Acoustical Technology Training Archived 27 April 2009 at the Wayback Machine by Keith Hill
"Idea of Sound - Measuring the Old Italian Violins - A Vowel Tone". Archived from the original on 30 March 2009. Retrieved 30 December 2009.

youtube.com

Fernandez "Custom Set-up" for frets, etc.; video demonstration
Overtone singing, Frequency Spectrum of the voice, showing the fundamental and various overtones: octave, ..., and high-intensity higher overtones (a melody is created, by shifting the intensity to various overtones, while others are more suppressed)
Movable frets of a Walter Vogt guitar
Herve R. Chouard: movable frets images images video - see from 3:18 to 3:49
Example: José Romanillos (although he acknowledges that plate tuning may provide benefits: "a field to think about") looks upon plate tuning rather critically and—as can be seen from a video—he neither understands it (this can be deduced from his rather confused presentation, and strong difference when compared with Somogyi's presentation), nor does he use plate tuning in his own guitars.