84 Report on the Trials of Sheaf-Binders, ^-c. 
in reference to the twister is more readily understood by refer- 
ence to Fig. 9. 
Fig. 8. — Position of the Arms of McCormicFs Sheaf-Binder after 
binding the Sheaf. 
Fig. 9 shows the point of the binder-arm descending into the 
grain. 
Fig. 10 shows the position of the binder-arm and wires 
preparatory to the operation of twisting. 
Fig. 11 shows the action of the pinions after the first revolution. 
Fig. 12 shows the twist completed and the wire cut. II will 
be seen that a second twist has been made below the pinions at 
the same time. This is done in order to maintain a continuous 
wire, and does away with the necessity for holding-jaws. 
Fig. 13 shows the different positions of the wire, according to 
the progress of the operation. 
Fig. 14 is an excellent representation of the twister-pinions 
and differentiated gear of the segment. The fact that the upper 
teeth of the segment are more numerous than the lower ones causes 
the teeth of the two pinions to close at a particular point of their 
