[4] “Essai sur la naissance et sur la formation des voyelles” in Rozier’s Observations sur la physique (Paris, 1782), Supplément, xxi. 358 seq.,, with two plates. The description of the instrument begins on p. 374, § xxii.
[5] See “Über die Erfindung der Rohrwerke mit durchschlagenden Zungen,” by Wilke, in Allg. musik. Ztg. (Leipzig, 1823), Bd. xxv. pp. 152-153 and Bd. xxvii. p. 263; also Thos. Ant. Kunz, “Orchestrion,” id., Bd. i. p. 88 and Bd. ii. pp. 514, 542; and Dr Karl Emil von Schafhäutl, Abt Georg Joseph Vogler (Augsburg, 1888), p. 37.
[6] Data zur Akustik, eine Abhandlung vorgelesen bey der Sitzung der naturforschenden Freunde in Berlin, den 15ten Dezember 1800 (Offenbach, 1801); also published in Allg. musik. Ztg. (1801), Bd. iii. pp. 517, 533, 565. See also an excellent article by the Rev. J. H. Mee on Vogler in Grove’s Dictionary of Music and Musicians.
[7] See Data zur Akustik, and a pamphlet by Vogler, “Über die Umschaffung der St Marien Orgel in Berlin nach dem Voglerschen Simplifikations-System, eine Nachahmung des Orchestrion” (Berlin); also “Kurze Beschreibung der in der Stadtpfarrkirche zu St Peter zu München nach dem Voglerschen Simplifikations-System neuerbauten Orgel” (Munich, 1809).
[8] See Allg. musik. Ztg. (1823), Bd. xxv. pp. 153 and 154 note, and 117-118 note.
[9] A description of Mälzel’s panharmonicon before the addition of the clarinet and oboe stops with free reeds is to be found in the Allg. musik. Ztg. (1800), Bd. ii. pp. 414-415.
[10] In the article in Grove’s Dictionary the screen is said to have been in the wind-trunk.
[11] See Allg. musik. Ztg. Bd. iii. p. 523.
[12] See J. B. Biot, Précis élémentaire de physique expérimentale (Paris, 1817), tome i. p. 386, and his Traité de physique (Paris, 1816), tome ii. p. 172 et seq., pl. ii.; “Über die Crescendo und Diminuendo Züge an Orgeln,” by Wilke and Kaufmann, Allg. musik. Ztg. (1823), Bd. xxv. pp. 113-122; and Allg. musik. Ztg. Bd. xxiii. pp. 133-139 and 149-154, with diagrams on p. 167 which are not absolutely correct in small details.
[13] J. B. Biot, Traité, tome ii. p. 174.