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Henry Bushby Transcription Pages

VM533B94v2-p257.jpg

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257
A Theory of ^ Plait Knots founded mainly
on the foregoing (original) diagrams.

(cf VI. P259.)
(i.) “Knot”: definition of: A knot is any
complication of an endless cord or cords which
cannot be undone entirely undone without
cutting dividing one or more of the cords.
^ while the cord or cords remain endless.
[In discussing series of knots the
term is sometimes used to include the
first of each series, which is always a
twist that can be entirely undone by
untwisting alone, but no ambiguity arises
from this. Such a twist is sometimes
called a Twist Knot. Note that there
is a whole series of knots consisting
of twists within the definition of a knot,
its first excepted. Moreover any crossing
of two cords may be regarded as a single
twist.

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