once
apparent. Indeed, a rubber or leather sack, stitched in this way, will
contain water without leakage--a very extreme test.

_Revolving Shuttles_.--The class of shuttles known as revolving or
rotating, and which really consist of a combination of the disk shuttle and
the earlier rotating hook of Wilson, have been under trial by several
makers for many years. If, for example, the oscillating shuttle we have
just examined were to complete its circular movement, it would constitute a
revolving shuttle, but would not be quite similar to those devices now
known as such. The most remarkable device of this kind yet introduced is to
be found in Wheeler & Wilson's machine known as No. 10 D, and invented by
Mr. Dials last year. It consists, in fact, of a detached hook, and its
inventor declines to class it with shuttles at all, styling it a detached
hook. It consists of an exterior shell or skeleton of steel, capable of
rotation in an annular raceway. Its detachment from the axis forms a
striking exception to the general construction of interlocking apparatus in
this company's machines. Under the beak of this curious device is found an
oblong recess, into which fits loosely a carrier or driver, rotating with a
differential or variable motion. The space between the carrier and the
sides of the recess is sufficient to permit the free passage of the thread
in encircling the shuttle, and the differential movement ingeniously
releases the contact between the hook and carrier. The skeleton of this
device is only one-sided, and does not really carry its bobbin in the
course of its revolution. The bobbin is placed in a cup-like holder, which
lies within the shuttle or hook body, and is retained in position by a
latch hinged to the bed of the machine. The cup and bobbin are prevented
from partaking of the rotatory movement by a steel spur projecting from the
cup, and fitting loosely into a notch in the latch. Tension upon the under
thread is obtained by passing it under a tension plate upon the bobbin cup.
Twisting of the thread is by these means entirely obviated. In this
apparatus, the disk-like appearance of the bobbin is partially lost in its
considerable breadth, and there is thus a distinct departure from the lines
of the ring shuttles before mentioned. The diagrams exhibit the hook in
several positions during its revolution, and the position of the threads
corresponding thereto.

[Illustration: FIG. 2]

_Fixed Rotating Hooks_