Lettera dell'autore del nuovo cembalo angelico inventato in Roma nell'anno MDCCLXXV (Rome Zempel, 1775)
"harpsichord … with soft leather plectra … with two sets of double-tongued jacks, each with normal quill plectra on one side and soft leather on the other. By means of a pedal, the registers could be moved so that the two sets of 8' strings were both plucked either by quill or by leather." (John Koster, "Cembalo angelico", Oxford Music Online)
ms. title-page, fronting the original printed version
The author could be Johann Christian Müller -> 'Ecrits imprimés concernant la musique', RILM BVI2 (München-Duisburg: G.Henle Verlag, 1971), p.603-04
Ex libris Alfred Cortot (beautiful colored plate, small stamp with initials)
Keywords: 18th Century (1701-1800); Organology; Harpsichord; Rome (Italy)