‘ORGAN. 
leather or web, and at the other three = oe = folds 
i r board 
he wind 
It will eafily be 
bel- 
lows of this kind, to keep 
Mofkt of the Englifh jaeck oreas have three ; and man 
of the large German inftruments = Dr. Burney informs 
us) have twelve and even fixteen pai 
Double bellows are made with Hee boards ; ab, (fig. 1 
the rifer ; cd, the middle; and e,f, the eadee ae 
At g; inthe feeder, is an aperture, and pallet to receive the 
air ; at 4, in the middle board, is the pallet of communication ; 
and at z, in the rifer, the ace pallet, which is contrived to 
open, when the bellows are ficiently a e rifer 
empties itfelf into the wind trunk at c. old bellows of 
this kind, the rifer is connected math: the middle board, in a 
now ufual 
s¢ 3 la lanterné.’? L’Harmonie Univerfelle, folio, Paris, 
Phe found board (ig. 12.) is made of an oblong frame, 
the upper fide of which is covered by a ftout board. 
the two longeft fides of the frame, and in the eae fide of 
the board, grooves are dug, in which are fixe umber of 
bars of wood; dividing the box thus sigue into Lele 
ie completely {eparated from each othe 
f holes, correfponding with the number of r ae of sie 
of which the organ confifts, are bored through the upper 
fide of the found board into each channe The number of 
ed by the compafs of the organ; there 
being ufually a channel to each finger-ke 
board. 
lows apt th 
ews a pallet with its Seay 
All the under fide of the 
the wind cheft, is clofely peer with leather, or parch- 
ment. 
Upon the upper fide of the found board are placed thin 
bars of wood, called the fliders ; i extending the whole length 
of the found board, and pierced with holes, correfponding 
with thofe bored through the found board, into the chan- 
nels. Thefe fliders, ped moveable in grooves in a tranf- 
verfe dire€tion to the channels, admit, or exclude, the wind 
rom any rank of pipes placed over them, as the holes cor- 
refpond with, or cover, thofe of the found board. Liaftly, 
upon thefe are fcrewed the ftock boards; which are alfo 
bored with holes correfponding with thofe in the fliders and 
found board; in which the pipes are placed. The racks 
are thin boards mounted on {mal aay pierced to re- 
ceive the upper part of the feet of the pipe 
"The key movement is a combination of eee and levers, 
or of quadrants connected by woo rods; fo contrived, 
that each key, when prefle ee may open its corre- 
{ponding pallet in the wind cheft, a 
to the pipes, ftanding over the changel which’ the pailet 
draw-ftop movement is alfo a combination of levers 
and rollers, fo .contrived, that e 
or fhut its ee 
wind from tha k of pipes 
unnel himney at the top, sen n 
Various faseaale have been ufed for ie fae Bari n, ‘hat 
the moft common pra@iice is to make the ftopped pipes of 
wood, and the open and reed pipes of a metal compofed 
of tin and lead. 
Plate Jl. figs. 1. and 2. reprefent a front and feétion 
of a {topped Goode pipe. In fg. 2. ais a fquare block 
of wood, correfponding with the ietioe diameters of the » 
pipe, upon which the back and two fides are glued. 
this a channel] is cut, in the direction of the fhaded line, 
for the paflage of the wind, which entering at the foot d, 
paffes through the channel in the block, and the cavity 
of the lip or top piece 4, and ftrikes upon the tharp edge 
of the front at ¢, the mouth; moveable wooden 
tompion, covered with leather to make it air-tight. en 
this is drawn outwards, the tone of the pipe is flattened, 
and when puthed inwards, fharpene 
Be 3. and 4. reprefent the front and eee of an open 
metal pipe which is a hollow abi 
and is ates arate of the pipe 
bya ee called the langue, or tongue, a, which antwere 
the purpofe of the block in the wooden pipe. e wi 
paffes sieougn a narrow pay at 4, and ftrikes u 
upper fide of the mouth {mall ear is ufuail; 
fixed on each fide of urpofes of en- 
by opening the tops with a 
and by clofing ae with the infide of the cone, to flatten 
er 
ia 
o 
m. 
Figs. 5. and 6. are the front and fe€tion of an half ftop- 
ped pipe, or pipe ¢ a la cheminée.’’ Thefe pipes are 
tuned by opening or os the ears, which are made very 
large for this pur 
. is the cs tae reed pipe, confifting of two 
parts, the foot, a, and the tube or body of t : pipe, d. 
The tube is foldered to a block of metal, c, (figs. “oe 9:) 
which exaétly fits into the upper end of the foot. n this 
is fixed a hollow demi-cylinder, 4, of brats, called the 
eed, 
