48 On the Drawings of the Patent Harmonic Piano-Forte, 



tached to the keys for throwing up the hammers, k the 

 sockets for guiding the. levers, / is the receiver for the ham- 

 mers attached to the keys, m the dampers, and nn its sock- 

 ets fixed to the block o which supports the sounding- 

 board p ; 9 is the bridge for the strings. The upper move- 

 ments, marked 1,2,3, are fastened with screws and small 

 brass plates upon the standard block 4. These by the three 

 leFt-foof pedals bring on the flats from the bass to the treble. 



The three under movements, marked a, /■, c, are fastened 

 with screws, as the upper movements. The first of these 

 three movements [a) is let into a groove in the standard 

 block 4, under the upper movements. 



The second movement {I) is under the standard block. 



The third movement (c) is fastened on the bevel of the 

 standard block. These bring on the sharps, by the three 

 right -foot pedals, from the treble to the bass. These move- 

 ments or pedals may be reversed, the same purpose will be 

 answered. 



The regulating screw 5, in the regulating board 6, is for 

 regulating the hammers 8. 9 is a small double square 

 of iron, one end of it is screwed to the standard block 4, 

 the other end is screwed to the regulating board 6, to keep 

 it steady: each hammer has a separate centre-pin fastened 

 in a piece of brass marked 10. Two of these pieces of brass 

 with the hammers are screwed to each of the six movements 

 (1, 2, 3 and a, h, c) within the octave. 



The keys are independent of the hammers, and the action. 

 In the two profiles (fig. 2), which are taken on a plane 

 parallel to fig. 1, but at the opposite ends of the movement ;■ 

 sss are the springs acting on the ends of the respective 

 movements I, 2,3 and a,l>,c, the springs are fastened to the 

 action stool 4; pp are the pedal irons for the same: these 

 are fastened under the bottom of the instrument, and go 

 through the bottom of the right and left side of the action- 

 stool, as is described in the profiles; when therefore a right- 

 or left-foot pedal presses the movement, a spring at the other 

 end, belonging to the movement, will, (when the pedal is 

 left off.) brino- the movement in an instant to its former 

 place. 



Fi"". 3 is a plan looking down upon the movements, 

 when there are 6 of them or 6 pedals, 1, 2, 3 are the move- 

 ments, the same as in ihe former figures, 8 the hammers, 

 and 10 the pieces of brass supporting them, and affixed with 

 the movements, the letters in the row 14 (which are sup- 

 posed to be marked on the hammers) are the 12 standing or 

 It xcd notes as in (Mir common compass within the octave, viz. 



three 



