362 Mr. Treadwell’s Description of a Machine, 
the pulley 5c a belt passes to and over the pulley 6c, which is 
fixed upon the shaft 7c, running in proper boxes in the upper 
part of the frame 4 4, &c. The shaft 7c has the pinion 8c fixed 
upon it, and this pinion drives a wheel 9c, which is fixed upon 
the shaft 1d, running in boxes upon the top of the frame 4 A, 
parallel to 7c, and carrying, besides the wheel 9c, the pinion 2d. 
The pinion 2d drives the wheel 3d, which is fixed upon the shaft 
of the pulley B. 
To understand the operation of the regulator, the comb, and 
other apparatus connected with and necessary to it, let us sup- 
pose the roving of hemp to have been passed through the tunnel 
L, and along the hatchel-belt, and its end to be between the 
drawing-rollers SS. Let us also suppose that a constant rotary 
motion be given to the rollers S'S, in the direction required for 
drawing out the filament, through their connexion, by the shafts, 
wheels, pinion, &c., which have been before described, with the 
pulley a, which is driven by a belt carried by any sufficient power. 
The motion from the pulley a must likewise be communicated to 
the pulley 3c, and from thence through the belt passing from 3e 
to 4c, by which the shaft ff must also be turned. Suppose, 
moreover, that the thumb-nut upon the top of the rod 1a has 
been so fixed, that when the filament, between the rollers S'S, is 
of the required size, the catches m m’ n shall also be disengaged. 
In this state of things the motion of the shaft ff will not be com- 
municated to the wheels g g’, nor to the star-wheel 4a, but they 
will all remain at rest with the shaft f/frevolving in them. As 
the hatchel-belt is, under this condition, stationary, the roving is 
not advanced to the drawing-rollers, and it must therefore soon 
happen that the filament will become too small; as soon as this 
is the case in a small degree, the upper drawing-roller, which 
presses upon and is supported by the filament beneath it, must 
