On the Drawings of the Patent Harmonic Piano-Forte. 49 



.liree sharps, two flats, and seven naturals; the letters in the 

 upper row 15 are the 12 additional notes wiiieh I have in- 

 troduced, the six sharps are ohtained by the three rigiit-foot 

 pedals, the six upper ilals are obtained by. the three ieft font 

 pedal*. We have, therefore, twenty- lour notes in the octave 

 with our common scale. 



Each of the three right-foot pedals for the sharps bring 

 on in addition, two fharps in the octave from the treble to 

 the bass, as lollous : 

 The first right-foot pedal brings on by |Df< A* -^ 



the piece of brass marked m fig. 3 jlO''^ 10"' When 



rr-. 1 J 1 c- n drawn 



Tne second do . . . .do iL* B* !,„,„^ i, 



%"-'— '^iiii-frbS 



The third do . . . .do iFc-* C*'- [ end. 



Ry the brass 10><i \Q'"^J 



In like manner, each of the three left-foot pedals for the 

 flats, brings on in addition two flats, in the octave, from 

 the bass to the treble. 



The first left-foot pedal I Ab Db TWhen 



' ' I drawn 



The second . , [ Gb Cb <; towards 



The third ." I Fb Ebb ! /J^'' ^^^' 



' Lble end. 



In fig. 4, the range of letters marked 14, are the 12 

 standing or fixed notes a? in our common compass withm 

 the octave, viz. three sharps, two flats, and seven naturals; 

 of the eight upper additional notes, the four sharps are ob- 

 tained by two right-foot pedals, and the fnir flats are ob- 

 tained by two left-foot pedals: we hav£, therefore, only 

 twenty notes in the octave with our common scale, and 

 ihey are obtained in ihc same manner as before described 

 of fig. 3, with 6 pedals. But, 4 of the standing or fixed 

 notes, viz. G, AjD,E, remaining unmoveable, being fast- 

 ened to the standard block 4, as is shown also in fig. 1, 

 whereby we cannot obtain F**, C*«, Fb, Bbb. We may 

 reverse the movements or the pedals to brinti; on the flats 

 from the treble to the bass, and the sharps from the bass 

 to the treble, bv which contrivance we uain the same end. 



In fiir. 3, with 6 pedals marked 1, 2, and 3 movements ; 

 and in fig. 4, with 4 pedals marked 1,2 movements, will 

 be easily and clearly shown how 2 notes in each octave 

 are fastened to each movement, and how the movements 

 slide in brass plates under screw heads when used by the 

 })edals. 



V^ol. 38. No. 159. Juli/ 1811. D Dcscrip- 



