A complete tutor for the Double duet, with an introduction devoted to the theory
of the keyboard arrangement and the leveraging of patterns among key signatures.
Published by Wheatstone & Co., deposited at the British Museum
28 July 1855. 27 pages. Printed in large format, trim size 9.5 inches by 14 inches.
Photographic documentation of very early Double duet
No. 23 has only 45 keys, smaller than the 57-key
size which is shown in the tutor or the 67-key size
exemplified by Danny Chapman's No. 14.
It contains an original additional baffle to reduce the volume of the bass side.
Historical business records from C. Wheatstone & Co. are held at the
Library of the Horniman Museum in London. The earliest ledgers from the Wayne Archives
contain company sales records from the late 1830s to the 1860s (though with some
large gaps) along with production records from the 1860s to the 1890s and some
early records of wages and other payments. Later ledgers from the Dickinson Archives
contain production records from 1910 to 1974, again with some gaps. All known ledgers
have been digitized (some 2,300 pages in total) and made available free on this website for