**The
Calculation Of Knot Density**

**Knot
density refers to the number of knots per square inch or per square decimeter.
The higher the number of knots, the finer the weave. Increased knot density is
not synonymous with increased quality. It is only one of the factors to be
considered.**

**Knot
density is determined by counting the number of knots per horizontal inch (along
the weft) and the number of knots per vertical inch (along the warp) and then
multiplying the numbers together. In practice, this is sometimes difficult
because individual knots can be
difficult to isolate from the back of the rug and it is generally not possible
to isolate separate knots from the front of the rug.**

**Usually
warps are level and in the same plane within the rug. If the warps of the rug
lie on the same plane, each knot (whether Symmetrical or Asymmetrical) will show
on the back of the rug as two nodes. This situation is illustrated in the
diagrams shown above.**

**Sometimes
the warps are depressed or offset so greatly that, from the back of the rug,
alternate warps are hidden. If this occurs, each knot will show on the back of
the rug as a single node. This is diagramed at the right with an
example utilizing symmetrical knots, but this can also occur with asymmetrical
knots and different degrees of warp depression or offset When the warp is offset
90 degrees, as in the second example, the alternate warps will lie on top of its
predecessor.**

** Chinese
rugs, the number of rugs running horizontally along a linear foot is
determined and this is referred to as a 'line". For example, a
"90-line" carpet has 90 knots per linear foot. Chinese rugs have
severely depressed or offset warps, so you will only see one node of the knot on
the back of the rug.**

**The
knot count in Pakistani rugs is graded as "10/20" or "12/24"
with the first figure being the number of knots per horizontal inch and the
second number being the number on knots per vertical inch. These rugs ( with the
exception of many Bokharas ) also have severely depressed or offset warps, so
you will only see one node of the knot on the back of the rug.**