On the Scales of Chrislchurch and RussePs Organs. 4 1 7 



and Diesis make the major Limnia in all such scales, or 

 l + d = L; we have 7L + 5l = VlII,as in the douzeave above. 



The Siezave Sca.\e of 16 Notes, on the Foundling Hos- 

 pital Organ, tffecied by moving a stop sideways by ihe 

 hand, is as follows ; viz. 



C C*Db D D^Eb E FF*G G^TAb A A'Tfib B c 



») e ^ 3 f s s -S' s £ GJ :a e :^ s 



idlldlLlLldlldlL 

 Here the Octave in perfect Intervals, consists of 4S + 

 4: + 43 + 2£ + 2g : and since 3 + g =S and ■"■ + e = S, 

 this equation reduces to 7S + 3"^) + 2£i, as before. The 

 regularly Tempered Octave in this case, consists of sL + 

 9I 4- 4d ; and since 1 + d = L, this becomes 7L + 5I = 

 VIII, as above. 



The Dixseptave Scale of 17 Notesf, on the Christchurck 

 Organ, in Surry Road, erect:d by Mr. Thomas Elliot, in 

 May, 1812, under Mr. Hawke's Patent, effected by two 

 Pedals ; or, on the Piano Fortes now exhibiting by Mr. 

 Bill, at No. 75, in Newman- street, is as follows, viz. 



C c7bb D D« Eb E F F^Gb G G*Ab A A*Bb B c 



1 d 1 1 d 1 L 1 d 1 I d 1 1 d 1 L 



Here the Octave in perfect Intervals, consists of 2S -f- 

 60)+ 4:: + 2£ + 3g; and which, since sS = 3S> + 3g, 

 and 2S = 2 ; + 2£, becomes 7S + 3r3 + 20, as before. 

 The regularly Tempered Intervals here are, 2L -f lOl + 3d 

 in the Octave ; which, since 3L= 5\ + 3d, becomes 7L -i- 

 3l as before. 



Tht. Dixneiifave Scale of 19 Notes, on an Organ which, 

 Mr. Russell senior, made about the year 1780 (see Dr. 

 Kemp'sMusical Magazine, vol. i. p. 170 and 188, and Mr. 

 J. Marsh's Theory of Harmonics, p. 18), is as follows, viz. 



C C*Db D D*Eb E E*F F*Gs G G*Ab A A*Bb Bcb c 



&) e ^^3 £ s ' e ^ G ^'y i^ ^ '^ e '^ G ^ 



id lldlldldlldlldldl 

 Here 8>: + 4~ + 2g + 3g = VIII ; and since bS = 

 SS" + 5e, and 2S = 2 + 2.=, we have 7S + 3 Vi + 2J, 

 as before. Also 12I -f 7d = VIII, and since 7L = 7I + 

 7d, we have 7L + 3l, as before. 



+ Mr. Kirkman is said to hnve made Instruments with 17 notes, liefore 

 tlie year 170O, see Dr. Kemp's Mubical Magazine, vol.i. p. 131; and the late 

 Mr. Charles Claggct also did the same. 



The 



