86 TECHNOLOGY. 
whilst one of the catch-hooks, m or n’ (pl. 18, fig. 1), is lifted from the 
notch in the bar /’, permitting the other weight to move the rod in the 
opposite direction, and the bevel gear a’ to engage with the other of the 
two wheels 0’ or ¢’. 
Upon the shaft is an endless serew, ¢', which works in a horizontal wheel, 
F', by means of which and a small pinion upon the upper end of the shaft 
carrying 7’, the rack, /’, is moved (pl. 17, jig. 23, and pl. 18, fig. 1). This 
rack is connected by means of the rod 7’ with the apparatus u, for the pur- 
pose of shortening the traverse motion of the beam 2, and thus forming the 
tapering ends of the bobbins; the rack /’ is also connected with the bell 
crank lever ¢’, which has at the sides of its upright branch two screws, for 
the purpose of alternately raising the caéch-hooks m and n’ whenever the 
lever ¢’ arrives at one end of its traverse motion. In jig. 1 is seen the man- 
ner in which this is effected. The other end of the bent lever 7’ raises or 
depresses one end of the balance-beam v’ at the end of each traverse motion, 
and thus stops the action of one of the weights d and p, whilst the other is 
drawing the bar 7’, so that the catch m or n’ not previously raised by the 
screw w’, falls into the notch in the bar /’, holding the wheel a’ in gear, until 
the bent lever 7 at the other end of the traverse motion raises this catch 
and suspends the other weight. We can thus perceive how the rod 7 is 
regularly moved to the right and left, and have only now to show how this 
motion is constantly shortened, and communicated to the beam 7; @” is a 
curved arm, vibrating upon a centre 6’, its other end being attached to the 
rod @’ (pl. 18, fig. 1). During the working of the machine, a toothed plate 
ce” slides downwards, in the teeth of which and upon opposite sides two 
clicks engage, @’’ d’’, which are connected together and kept in contact with 
the rack-plate c’ by a spiral spring. When the arm a’, moved by the rod 
d', has reached the end of its traverse motion, it presses one of the clicks 
against the head of the set screw e”, which raises the click out of the tooth 
of the sliding piece c’’, and permits it to fall the distance of half a foot, the 
other click ¢’ immediately catching it. Thus as the extremity of the lever g’’ 
constantly approaches the centre of oscillation 0’, the traverse motion com- 
municated by the rod g’’ to the beam 2 becomes shorter, the arm @” vibrating 
always through equal spaces. The teeth upon the sliding-rod ¢” are cut 
at alternate intervals on either side, so that its motion at each time is limited 
to half a tooth. A” is a guide screwed to one of the posts @ to guide the 
rod 2” connected with the rod g’; a’ is joined to a slotted arm #” upon the 
beam 7, on which the tube-carriers, %, stand, as explained above. At each 
traverse motion of the arm @’’ a pin, 6”, projecting from the bent piece, 
strikes against a lever, m’’, the end of which is seen in pl. 17, fig. 22, and 
which, through the lever n” and click 0’, moves the ratchet-wheel 1 upon 
the same shaft as the pinion g (pl. 18, jig. 3) one tooth, whilst another 
click, p”, prevents the ratchet-wheel from being forced back by the weight 
of the beam, 2, which gradually rises as the spools enlarge. When the 
toothed rack ¢” has reached its lowest point, a projection upon its side, not 
seen in the drawings, strikes against the end of the lever m’, which sets 
free a catch at its other end, which makes the upright lever?’ move the 
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