< 4 ? ) 
HHH is another Circle of Blanketting, likewife 
fix'd to the outfide of the Wheel, and rubbing a- 
gainft the Cafe, that the Air violently driven againft 
the inner Circumference of the Cafe, may have no 
way out, but at the Blowing-Pipe at B. 
There is on the outfide of the other Flat of the 
Wheel, where the Handle is fix’d, a Ring of Blan- 
ketting, like HHH, oppofite to it; but none op- 
pofite to ggg, becaufe the Wood there is not open, 
but comes home clofe to the Axis. 
Fig. 3. gives a vertical Seftion of the Wheel and 
Cafe a little forward of the Axis, drawn by a Scale 
twice as large as that of the other two Figures. 
A the Axis fupportcd by the Irons A, a, cyliu- 
drically hollow’d, except the upper Part, where a 
Pin keeps in the Axis. 
BD, the Cafe with the Sucking-Pipe S a. 
E A, the Prop for one End of the Axis. 
1, z, the Opening into the Wheel. 
gg, the Eminence of the Wood to which is fix’d 
the fmall Ring of Blanketting. 
The four black Marks, one of which is near H, 
reprefcnt the Se&ions of the two other Rings of 
Blanketting. 
