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Henry Bushby Transcription Pages

VM533B94v6_261.jpg

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261
here called a “Torsion Knot”, would
result, and in such a case the
tube would be said to have been
twisted through one “arc”. If the
twisting were such as to just
suffice to bring the ends of alter-
nate cords together, the tube would
have been twisted through two
“arcs”, and so on. The actual mea-
sure of the arc is of no im-
portance, since all the arcs are
equal, and can be easily calculated,
with any given number of cords
parallel & equidistant from one
another on the surface of a tube.
Thus with two cords, i & ii, a
twist through one arc (180 [degrees]) brings
the ends of i & ii together. A twist
through 2 arcs, brings the ends of
i together & of ii together, & so on al-
ternately. With 3 cords, i, ii, & iii, a
twist of 1 arc brings the end of i on ii,

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