THE WIRE 171

60 wrarp wires, then there are 60 channels formed in the top of the boxes,
which, if the trouble is allowed to continue, will have a formation like a minia-
ture piece of corrugated paper. Obviously when this condition has arisen it
is impossible for the wire to travel laterally across the boxes, an essential factor
to the successful running of a paper machine wire. It will be readily under-
stood that when the slightly thickened blobs of the weld at the joint meet the
grooves they will not fit into the grooves, as they are larger in diameter than
the wire which formed the groove. This consequently raises the wire a small
fraction off the top of the boxes, making a momentary break in the vacuum,
with a consequent mark in the paper. This is also applicable to a soldered

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Fie. 57 FIG. 58
[The Uniifd Wm Works Ut.
Bcs. 57 AND 58,—WEIJWED AND SOLDEIED JOINTS.
joint. Not only does this objectionable feature wear out the joint, but it also
wears out the whole wire by causing grooves in every under-side warp knuckle
as it tries to travel to right or left across the boxes.
Fig. 59 is a plan view of the tinder side of a hand-sewn seam which has
been allowed to groove, and Fig. 60 is a plan view of the under side of a twill
wire similarly worn.
Close observation of the wire when in operation should readily reveal when
it is grooving. In the first place a knock can often be heard as the joint hits
the front of the suction boxes, but apart from this the under side of the wire
shines and glistens very brightly as compared to a wire running in the normal
manner.