of String Binders at Derby. 
279 
gathering- arm (4, Fig. 15). Upon the descent of the needle, the 
compressor-cord and strings are drawn tightly round the sheaf. 
As soon as the needle-eye 5 (Fig. 15) has descended within about 
three-quarters of an inch of the gripper, the needle pauses 
in its descent, and the rotary hook 6 (Figs. 16 and 17), which 
receives its motion through the cog-pinion 7 (Figs. 19 and 18) and 
groove 26 in the cam-wheel (Fig. 19) comes forward and lays hold 
Figs. 18 and 19. 
of the two strings, which lie in its path in the opening 9 (Fig. 16), 
which is the same opening that the needle passes through. 
This, hook 6, works in a tube or case, 10, and is so arranged 
that it can spring radially, and, by uniform friction against the 
case, hold the strings, whether coarse or fine. As soon as the 
hook has laid hold of the strings, and made one-third of a revo- 
lution, which ensures the strings being securely held against the 
case so that they cannot slip back, the gripper, 3 (which is 
