PRR iB 
H. Ward Poole on Just Intonation in. Music. 361 
The Double Diatonic Scale has two notes differing from two 
of the triple scale on the same tonic—which is F; although its 
tones are all in the key or scale of C, being identical with the 
Triple Diatonic of C, with the exception of the change of b into 
B’. But its ending and tonic is F. Having thus provided for 
the notation and distinction of these different series of Primary 
st 
effective ring. Especially in duets is this observed; the two 
voices are constantly giving pairs.of different colors. The 
duplicates or notes of the remaining series—there being three— 
monious, 6:7, and d 
n ¥, 
“grave second ” of the old theorists, and is the sixth of the: 
e of F, and 
“modulations within the key. 
Scale of C, harmonized, 
~ ODeFGabc ChaGFeDC 
unison b Cae F Ge eG FedC b unison 
The instruments of just intonation are those of free tones, 
as the voice, the violin class, and the trombones, etc., and those 
of fixed tones, as the organ and other instruments to be 
described. . . ey 
The Enharmonic Key-board for organs, etc., described in this 
Journal in July, 1867, while preserving its essential principles, 
is capable of being varied to embrace more or less series of 
