hese spools taken in regular order, and threaded through the
splits or openings of a reed which is placed in a suitable position
in regard to the winding-on mechanism. Some of the machines which
perform the winding-on of the yarn are comparatively simple, while
others are more or less complicated. In some the loom beam rotates
at a fixed number of revolutions per minute, while in others the
beam rotates at a gradually decreasing number of revolutions per
minute. One of the latter types made by MESSRS Urquhart, Lindsay & Co.,
Ltd., Dundee, is illustrated in Fig. 29, and the mechanism displayed
is identical with that employed for No. 4 method of preparing warps.

The V-shaped bank with its complement of spools (500 in our example)
would occupy a position immediately to the left of Fig. 29. The
threads would pass through a reed and then in a straight wide sheet
between the pair of rollers, these parts being contained in the
supplementary frame on the left. A similar frame appears on the
extreme right of the figure, and this would be used in conjunction
with another V-shaped bank, not shown, but which would occupy a
position further to the right, i.e. if one bank was not large enough
to hold the required number of spools. The part on the extreme right
can be ignored at present.

The threads are arranged in exactly the same way as indicated in Fig.
28 from the bank to the reed in front of the rollers in Fig. 29,
and on emerging from the pair of rollers are taken across the
stretch between the supplementary frame and the main central frame,
and attached to the weavers beam just below the pressing rollers. It
may be advisable to have another reed just before the beam, so that
the width occupied by the threads in the beam may be exactly the
same as the width between the two flanges of the loom beam.

[Illustration: FIG. 29 WINDING-ON OR DRY BEAMING MACHINE _By
permission of Messrs. Urquhart, Lindsay & Co. Ltd_.]

The speed of the threads is determined by the surface speed of the
two rollers in the supplementary frame, the bottom roller being
positively driven from the central part through the long horizontal
shaft and a train of wheels caged in as shown. The loom beam, which
is seen clearly immediately below the pressing rollers, is driven by
friction because the surface speed of the yarn must be constant;
hence, as the diameter over the yarn on the beam increases, the
revolutions per minute of the beam must decrease, and a