272 ■ Report on the Exhibition and Trials 
Fig. 5. — Section of W. A. Wood's String Binder. 
the tying gear, is provided with a cam motion, which throws 
the clutch out of gear during the binding operation, and when 
in gear communicates motion, first to a 12-inch pulley, and, on 
the opposite side of the machine, to a cam with geared segments 
which drives an arm underneath the table, which pushes off the 
sheaf when bound ; and lastly, at the extremity of the shaft, to 
a crank, which revolving works in a slotted lever giving recipro- 
cating motion to a shaft. No. 6, beneath the frame, driving the 
binding-arms. 
See Fig. 6, which gives an elevation of the machine. 
The 12-inch pulley on shaft No. 5, above referred to, has on 
its rim gearings for one-fourth of its circumference, which 
engages in a small irregular pinion with, two detents, which 
bear against the rim of the wheel and allow the small pinion 
to remain stationary until the geared segments engage in the 
detents, which then give an intermittent rotary motion to a small 
shaft. No. 7, provided with a small crank at its end, which, 
by means of a connecting-rod, supplies the reciprocating motion 
