98 TECHNOLOGY. 
which press the treddle levers p and P’, alternately up and down. These 
levers are connected by strings or wires with their respective heddles, 
which are in their turn placed in communication by straps, which play 
over rollers, ¢, at the top of the loom. 
Pl. 19, jig. 21, shows these levers isolated. The shuttle is thrown by the 
two levers, 9 Q, which are alternately moved with a jerk by the rollers, r, 
secured to the shaft, n, by means of arms, and working upon cams, s, con- 
nected with the shafts of the arms, qq. These arms are connected together 
at the bottom by a cord or strap, mounted with a spring of spiral wire. 
The shuttle is lodged in one of the boxes, ff, of the batten, n, and is — 
driven across along its shed-way by one of the pickers, gg, which run on 
the two parallel guide wires, 4 /, and are connected with the arms, @, by 
strong cords. | 
If by any accident the shuttle should stick in the shed-way, the blows of 
the batten, u, against it would cause the warp to be torn to pieces. In 
order to guard against this, a contrivance has been introduced for stopping 
the loom immediately, in case the shuttle should not come home into its 
cell. Under the batten u (pl. 19, jigs. 7 and 22) there is a small shaft, 2, 
on each side of which a lever, / and /’ (fig. 6), is fixed; these two levers 
are pressed by springs against other levers, 7m, which enter partly into 
the shuttle-boxes. There they act as brakes to soften the impulse of the 
shuttle, and allow also the point of the lever / to fall downwards into a line 
with the prominence at n, provided the shuttles do not enter in and press the 
spring-point, m, backwards, together with the upright arm /’, and thus raise 
the horizontal arm 7 above nm. When this does not take place, that is, 
when the shuttle has not gone fairly home, the lever 7 hangs down, strikes 
against the obstacle , moves this piece forwards so as to press against 
the spring lever or trigger 0 0, which leaps from its catch or detent, shifts 
the fork pp with its strap from the fast to the loose pulley, and thus in an 
instant arrests every motion of the machine. 
The shuttle is represented in jig. 8 in a top view and in jig. 9 in a side 
view. It is made of a piece of box-wood mortised out in the middle and 
tapered off at its ends, the tips being shod with iron points to protect them 
from injury by blows against the guides and the bottoms of the boxes. 
In the hollow part, a 6, there is a skewer or spindle, c, seen in dotted lines. 
One end of this skewer turns about the axis, d, to allow it to come out of 
the mortise when the cop is put on. 
e (see dotted lines in jig. 9) is the spring which keeps the spindle ¢ in its 
place by pressing against one of the sides of the square ends of the spindle. 
J is a projecting pin or little stud, against which the spindle ¢ bears when 
laid in its place. g is a hole in one side of the shuttle, bushed with ivory, 
through which the thread passes, after being drawn through a slit in the 
centre of a brass plate, A. In that side of the shuttle which is furnished 
with the eye-hole there is a groove extending its whole length for receiving 
the thread as it unwinds from the cop. 
The warp is wound upon the cylinder 1, and passes over the roller x; the 
cloth is formed at the point 7, passes over the breast-beam Mm, and is wound 
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