192 IMPROVEMENT wn THE 
effect, caufing it to yield a full and pure body of tone,. 
free from all jingle and very pleafant to the ear. 
N. B. What hath hitherto been called the tongue of the 
jack, I fhall denominate the palate ; and the fubftitute I 
have made for the quill, I fhall call the tongue. The 
propriety of this will appear in the defcription. 
Let A, figure 12, reprefent the palate in front, 
Place TH with a mortife cut through it for the tongue to: 
work in. -B, is the tongue, having two {mall holes. 
drilled through it, one in the centre of its motion and the 
other at a little diftance behind, for the reception of one 
end of a wire {pring hereafter mentioned. 
Figure 13, is the palate in profile, with the tongue pro- 
perly mounted and moveable on the centre pin. This 
figure alfo fhews how the palate muft be hollowed in be- 
hind to expofe the root of the tongue, and-the {mall hole 
in it for the reception of one end of the wire fpring. 
Figure 14, is a back view of the palate, fhewing the 
groove in which. the hair fpring of the jack lies, and a. 
{mall wire ftaple at 5, to which the lower end of the fteel 
{pring is to be faftened.. 
Figure 15, is the {pring which is to govern the tongue: 
It muft be of fine fteel wire, fomewhat annealed by being 
forcibly rubbed between pieces of leather or cork, and is 
formed. by winding the wire backwards and forwards with 
a tight hand, over pins driven deep and firm into a piece 
of wood. As the palate muft play freely within the fork 
or jaws of the jack, the windings of the {pring muft not 
exceed the width of the palate. The upper end of the 
{pring being run through the {mall hole in the root of the 
tongue and bent round, fo as to fecure it, and the fuper- 
fluous part cut off; the lower end of the fame {pring muft 
be run under the little ftaple (4, figure 14,) and. bent up- 
wards with a gentle ftrain, to as.to hook it on and fecure it 
to that flaple; the {pring will then operate with all its 
elafticity, and the tongue will be fubjeted to its operation. 
Figure 
