[Illustration]
At the Manchester Royal Jubilee Exhibition, Messrs. Butterworth &
Dickinson, Burnley, showed Catlow's patent dobby, which is illustrated
above, as applied to a strong calico loom. This dobby is a double lift
one, thus obtaining a wide shed, and the use of two lattice barrels
connected by gearing so that they both revolve in the same direction.
The jack lever is attached to the vertical levers, the top and bottom
catches being worked respectively by the two barrels, and connected
with the ends of the levers. To each of these catches a light blade
spring is attached, which insures them being sprung upon the top of
the knife, and thereby obtaining a certain lift. A series of wooden
jacks or levers are employed, so as to give a varying lift to the
front and back healds, in this way keeping the yarn in even tension,
and preventing slack sheds. The healds are drawn down by means of a
series of levers adjoining one another, and worked by means of a
rocking bar driven from the tappet shaft. When the shed is being
formed, the jacks are pushed down until it is fully open, and the warp
is thus drawn down with the same certainty as the upward movement is
made.--_Industries_.
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[UNITED STATES CONSULAR REPORTS. SPECIAL ISSUE NO. 10.]