ae ee a 
H. Ward Poole on Just Intonation in Music. 363 
of Series I being at this level, the black keys rise 0°45; the 
orange keys, (Series IV,) are 0°75; and the blue keys of Series 
III are 0-90, All the elevated keys are reduced in width, down 
to the base, so as to allow the finger to enter freely between 
them. The number of digitals being 48, each lever is taken at 
the half of these primary 24 divisions, and all lie in one level 
at the rear of the key-board. In construction, the number of 
pipes (or vibrators, in the cabinet organs) is reduced by using 
the same for those which being at the distance of 8 Fifths an 
1 Third are practically identical. (§ 29, 30 this Journal, July, 
186 
Justly-Intoned Pianofortes.—It is desirable to obtain a loud 
and full tone by a single wire, large and at full tension. Then 
with an enharmonic key-board and the triple sets of wires, the 
whole will be easily kept in tune, and will sound louder than 
if they were tempered. i ; 
Wind Instruments of the class of the horn, cornet, etc., 
depend, for the fundamental tone, on the length of the tube, 
and for the harmonies, on the tension of the lips. The funda- 
mental length may be varied by the common cornet valves or 
“pistons” and corresponding supplementary tubes to give the 
tones of series I. These valves are arra in the order of 
the fifths, or thus: F,C, G, D, A, E, B, ete. To play the 
triple diatonic scale of C will be used the valve of C (or the 
simple tube of the whole instrument, if so constructed) and 
those of F and G, on its right and left; the order of these dom- 
inants, etc., is the same in every key. For the sake of economy 
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