. 
H. W. Poole on Perfect Harmony, etc. 9 
the diatontl sales triple and er nee ich could easily 
managed, and in a manner uniform for all keys. 
20. This provisional key-board is me figured here, but may 
be understood by reference to figs. 1, 2 and 8, which contain 
also the additional series of sounds, it and V, 8 12. ia fig. 1 
ee the black key, d, be moved to the left until its left edge coin- 
with the right edge of C, its back end as now being in 
chick with the front end of the white key D; let e, f#, and 
the two keys (F’ and another not marked but really ES’) marked 
with versal lines indicating their color, red, be moved in the 
same direction and distance as d, till they are in contact, respect- 
ively, with D and H. dea é is no room now for d# and a’ rand 
their two companions by fis but we have all the key-notes, 
thirds and perfect cctenibe and the advantage of greater width 
in the white keys, which are nearly an inch and a quarter wide 
(1:21 in., the black keys being 0°45). This key-board, although 
deficient in the minor mode, from the absence of the series = 
and V, is still recommendable where economy is necess 
the music of the major key, including the beautifal chord of of 
the seventh, can be played; except in cases where certain 
dentals are introduced from the minor mode, as illustrated in ab 
example from Rossini in 
_ 21, A portion of the complete enharmonic key-board is shown 
in perspective in fig. 1, in the natural size—the length of the 
tis being reduced to ‘one-half by the perspective. The keys 
are of five different colors—represented here, the white and 
black by their natural colors, and the rest according to | 
rules, viz., the red by vertical lines, the blue by les and 
the yellow ‘by white stippled with black—and of as many differ- 
ent elevations. The Silowing table represents this. 
Series, Color. Elevation. | Example. 
z Key-notes, white 0°0 C, D 
I. Thirds, black 0-4 in. b,e 
Il. Sevenths, red 0°05 * FE’ 
IV. Dom. 3ds, minor, blue 0-10 “ d# 
VY. Dom. 7ths, minor, yellow 15 = a’ 
22. These keys all have vertical rma motion so that a 
touch on any part of their surface pr ways the same 
effect. This is attained—in one en Ser attacks, each to 
a wae of of cons rods, passing down through a couple of hori- 
bles where they are secured to a piece which communi- 
- gs Sc1.—Seconp Series, Vou. XLIV, No. 130.—Juxy, 1867. 
S ; 
