50 On the Dravuing^ of the Patent Harmonic Piano-Forte. 



Description of the Drawi>iii<; nfho^scii'MA^'s Patent Har- 

 monic Organ. 



Fig. 5, of Plate IX, is a profile of the keys and move- 

 ments, showing the new improvements; hut the parts com- 

 mon to all organs bcina: tir^t poi\itecl ont will render what 

 follows more explicit : these irre, A the finger keys, B the 

 key Frame, 3 8 the stickers, which are dnuhle the number 

 of those in the organs now in use, and D their sockets, E the 

 back-falls for opening the valves of their respective pipes. 



The front movements 1 , 2, 3 above each other are about 

 three- fourths of an inch above the keys, and they are fast- 

 ened upon the standard block 4, in the same manner as 

 desciibc'd in the piano; but the sloped end of the three 

 movements marked 5, rest behind upon the keys beljind-, 

 and they are hinged to the front part of the three move- 

 ments. The block 6, underneath the stickers 8, works in 

 the centre-pin 7; it is fastened beneath the under socket D, 

 and it rests upon the upper end of the movement 5, the 

 lower end of the sticker 8 rests upon the centre block 6. The 

 backfalls are fastened to the upper end of the sticker 8; 

 therefore when a key is pressed down in front, the keys be- 

 hind lift up the part of the movement 5, with the centre- 

 block 6: and the sticker 8, with the backfall, which opens 

 the pallet to siive the desired note ; but when more sharps 

 are wanted, by pressing the right- fot pedal, the front move- 

 ment with the hinged part of the movement 5j will shift 

 itseU" to the back end of the centre- block 6, which will 

 give the note that is wanted in the same manner as before, 

 only that the front note is now silent. 



The manner of this is shown in the plan, fig. 6, where 

 1 is the movement, and k a bar to which the movements 5 

 are hinotd: when 1 is moved endways by a pedal under 

 its screw-heads, it throws k away from it, under its screw- 

 heads / bv means of the brass rods m m. This motion 

 shifts the movement 5, fig. 5, from beneath, one end of the 

 centre-block 6, to the other. 



The back movcnieivts.act towards the front in the vci;y same 

 manner as the front movements which have been described. 



Instead of the centre-block, No. fi, it may be made with 

 springs placed in diflereni wgys, on a strong under-block, 

 as is shown in elevation at X, fig. 7, and in The plan, fig. 8. 

 The six movements niay be placed together in front, above 

 the kevs, or behind the keys, tlic flats and sharps inay also 

 be product^d in the same manner as in the pianos, the effects 



will be the same. 



The 



