358 Mr. Treadwell’s Description of a Machine, 
to the under side of each arm p p metal blocks or boxes q¢ q, which 
pass down to the clutch-boxes. ‘The under sides of qq are formed 
in the shape of a portion of a hollow cylinder, and are grooved 
so as to embrace the clutch-boxes upon the grooves, before de- 
scribed upon them through about one third of their circum- 
ference. (Fig. 11 shows the slide-bar 00, and arms with the 
boxes qq, separated from the other work. The fig. represents 
the under side of these parts.) A long shaft, or axle rr, pass- 
es horizontally from under the slide-bar oo to the right hand, as 
seen in the drawings until it projects beyond the frame 7 4, &c. 
(In fig. 2 this shaft is supposed to be broken off under the drawing- 
rollers SS, and the left-hand part is removed.) rrvris hung in 
centres which are fixed in the iron bearing s s. This bearing is 
bolted to the frame 4.4, &c., and prevented from springing by 
the iron brace 6d. The arm ¢ passes horizontally from the right 
end of rr, and the arm ¢’ rises vertically from its other end, di- 
rectly under the slide-bar 00. A steel spring u is fixed upon the 
shaft +7 near its middle. This spring runs along on the side of 
the shaft and turns upwards against the side of the arm / until it 
reaches the top of ¢’, against which it presses with its whole 
elastic force. A connecting rod passes from a hook in the top of 
the spring u to another hook fixed in the under side of the slide- 
bar oo. visa bent lever, its fulerum being a pin which passes 
through its middle and unites it to the bearing w, which is fixed to 
the frame 4.4. The vertical arm of the lever v is united at its 
top, by a connecting rod, with a hook, which is fixed in the bot- 
tom of the slide-bar, and the horizontal arm of the same lever is 
connected with the weight y. These hooks and connecting rods 
will be found in their places in fig. 5, from the description, no let- 
ters of reference being thought necessary. (It will be seen m 
fig. 1 that the shaft r7, and the bearing s s, are continued, in dot- 
