Item Type: Wheatstone Harmonic Diagram

Summary

Full Description: An original slip-cased Wheatstone Harmonic Diagram of 1824, in fine condition, and with the inked labels of "State University of Iowa Libraries, MTI-5. W56" The central rotating disc has its original ivory button and rear securing screw, and the thick board mount is engraved in the plate "C Wheatstone, Jan y 1st., 1824". The rear of the card mount bears the Iowa Library label, and an acquisition number 418855. The original slip-case is open down each side due to slight wear. Visit http://libraries.mit.edu/archives/exhibits/harmonic/    for more information on this early Wheatstone invention - The Collection has another fine example of an original Harmonic Diagram, once in the archives of the  "Physical Society, London" as Item NC.1.2.4-001 

Source Catalogue No: The Concertina Museum: 1.2.4-004