186 On Musical Temperament. 
actually is, in adjusting the intervals of the octave first tuned, 
st would occasion little difference in the whole. 
Scholium 2. 
‘The harmony of the TfIds and 3ds in any of the foregoing 
systems for the changeable scale is so much finer than it cap 
possibly be in the common Douzeave, that it seems highly 
desirable that this scale should be introduced into general use. 
But the increased bulk and expense attendant on the intro- 
duction of so many new pipes or strings, together with the 
trouble occasioned to the performer, in rectifying the scale 
for music in the different keys, have hitherto prevented its 
becoming generally adopted. To multiply the number of 
finger keys would render execution on the instrument eX- 
tremely difficult; and the apparatus necessary for transferring 
the action of the same key from one string or set of pipes ® 
another, besides being complicated and expensive, requires 
such exactness that it must be continually liable to get out of 
order. This latter expedient, however, has been deemed 
the only practicable one, and has been carried into effect, 
under different forms, by Dr. Smith, Mr. Hawkes, M. Loesch- 
man, and others. But Dr. Smith’s plan (which is confined to 
stringed instruments) requires only one of the unisons ‘ be 
used at once; while those of the two latter nearly double the 
whole number of strings or pipes. It deserves an experi: 
‘ment, among the makers of imperfect instruments, whether # 
‘changeable scale cannot be rendered practicable, at least of 
the piano forte,* without increasing the number of strings 
A method of rendering changeable the sound of the same pipes in te 
ergan, which had occurred to the writer, but which was not inserted al : 
who has succeeded, by means of shaders capable of being brought before 
the mouths of his pipes by the action of pedals, in giving them we 
Supiect sounds each, varying by two commas. (See the ipti 
od his Enharmonic organ, in Rees’ Cyclopedia, or Tilloch’s Phil. Me#) 
eae scale embraces 59 intervals to the octave, and is intended to product 
perfect harmony in all the keys, But as it will require the use of pet 
petually, even on the same key, and a ready and perfect knowledge of sal 
