286 
Report on the Exhibition and Trials 
minating at the end of its stroke slightly above the steel 
breasts. 
The gearing of the mutilated pinion (d) drives a pinion at 
its rear fixed on a loose sleeve working over the central axle, on 
which sleeve the collecting-arms are fixed. The cam on the 
mutilated pinion so engages in a stop on the aforenamed pinion 
that the forks are held stationary in a raised position whilst the 
tying is in progress. The string is carried in a reel-box on the 
back part of the frame e (Fig. 20). The box revolves as the 
string is being drawn out, tension being obtained from a spring. 
Fig. 20. 
The tying-gear works backwards and forwards horizontally, 
and is carried or supported on slides attached to the frame. It 
comprises what may be described as the needle-case (a. Fig. 22), 
with a tube inside, on the end of which is a corkscrew-formed 
looper, auger-pointed (i), with a hook just behind the point. 
This tube has a spiral groove cut along its length, terminating 
in a straight slot seen at c (Figs. 22 and 23). A pin 
(c^. Fig. 23), fixed in the needle-case cover and working in this 
slot, gives an intermittent rotary motion to the looper. 
