1851 Great Exhibition: Official Catalogue: Class X.: Joseph Anelli
From Graces Guide
511. ANELLI, JOSEPH, 76 Queen Street, Edinburgh — Inventor.
Centripetal regulating pegs and pins, which cannot draw back or give way, by which instruments can be tuned and regulated gradually in all their divisions, in less than half the time formerly required.
Also, a spring "capo-tasto," attached to the handle of the guitar, changing at once the diapason of the strings, so as to play in all keys without altering the printed notes or the position of the hand and fingers.
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