Last Updated：2025/12/29
Sentence
The
simplest
method
of
calculating
the
radius
of
a
curve
in
situ
is
to
measure
the
versine;
in
railway
practice
this
is
done
by
extending
a
tape
66
ft.
(1
ch.)
long
in
a
straight
line
or
chord
between
two
points
on
the
periphery
of
a
curve,
and
then
measuring
the
maximum
distance
of
the
rail
from
the
chord
at
the
centre
of
the
66
ft.
The
radius
in
chains
is
found
by
dividing
the
versine
in
inches
into
99.
Thus
if
a
versine
measures
3
in.,
the
radius
will
be
33
ch.
Quizzes for review
The simplest method of calculating the radius of a curve in situ is to measure the versine; in railway practice this is done by extending a tape 66 ft. (1 ch.) long in a straight line or chord between two points on the periphery of a curve, and then measuring the maximum distance of the rail from the chord at the centre of the 66 ft. The radius in chains is found by dividing the versine in inches into 99. Thus if a versine measures 3 in., the radius will be 33 ch.
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