AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[SECOND SERIES.] 
Art. I.—On Perfect sagas 8 m ogre the Double Diatonic Scale, 
and an Enharmonic Key-Board for Organs, Piano- — ete. ; 
by Henry Warp Poo.g, of "South Danvers, Mass 
1. SEVENTEEN years ago I published in this Journal* a theory: 
of Perfect Intonation in music, with a description of an organ 
made to obtain this result, which had then just been completed. 
The organ was provided with pedals and mechanism by whi 
the large number of pipes necessary for ts tuning could be 
played by the common key-board. It was supposed that all 
music, for the igen was in some key or ne This scale the 
organist could prepare by putting down a single pedal, which 
had the effect of ong the twelve finger-keys of each octave 
with twelve valves, an disconnecting all the others. As the 
music passed into other scales, by modulation, and other less 
marked transitions, the player, by touching the pedal of the ne 
scale, made the chan nges’ of sounds required. In the pcos 
paper, I shall describe a new re -board in which all the sounds 
contained in the organ are represented, and pat within con- 
trol of the organist, without aid from pedals or any interior 
mechanism; and which is — for any extent of modula- 
tion, or number of notes in the octave. It is uniform in all keys, 
an ‘the same succession of fislodies or harmonies is fingered the 
same in every signature. The pedal-base is also provided for __ 
by an appropriate key-board. I shall also treat of the scale _ 
heretofore unnoticed by theorists, to which I have given the 
name of Double Diatonic,t together _ — matters 
upon the oo and practice of perfect harmony. 
* Vol. ix, Jan., Mar. 1850. + Ssh Matti My 361080 
Am. Jour. Sci.—Sseconp Srnizs, Vou. XLIV, No. 130.—Juy, 1867. 
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