Jeppesen E6-B - Page 5

CHANGING
VALUES
In
order
to
accurately
read
the
scales
on
the
calculator
side
of
the
computer,
it
is
necessary
that
the
chang-
ing
values
of
the
graduations
of
these
scales
be
under-
stood.
When
using
the
“A”, “B”,
and
“C”
scales
to
solve
prob-
lems,
common
sense
must
be
used
to
determine
the
value
of
the
numbers.
If
a
short
distance
is
involved,
“25"
on
the
“A”
scale
might
be
read
as
“2.5
miles”.
If
a
long
distance
is
involved,
zeros
are
added
to
the
“25”
to
get
the
proper
answer.
For
example,
“25”
might
be
“250”
or
“2500
miles”.
First,
let’s
examine
the
changing
values
of
the
“A”
scale.
(See
fig.
2.)
If
the
number
“14”
is
used
as
14,
each
gradu-
ation
between
“14”
and
“15”
is
equal
to
.1.
If these
num-
bers
are
used
as
140
and
150,
each
graduation
is
equal
to
1;
if
used
as
1400
and
1500,
they
represent
10;
and
if
used
as
14000
and
15000,
they
are
equal
to
100.
Between the numbers “15” and “16,” there are only
five graduations as compared to the 10 graduations
between “14” and “15 “.(See fig. 2.) When these num-
bers are used as 15 and 16 respectively. each gradu-
ation is equal to .2; when used as 150 and 160, each
unit represents 2; when visualized as 1500 and 1600,
each unit is equal to 20; and when used as 15000 and
16000, each graduation equals 200.
NOTE
The graduations on the “B” scale are identical with those
on the “A” scale.
CHANGING VALUES
Figure 2
CHANGING
VALUES
Figure 3
The changing values on the “C” scale are somewhat
different than those on the “A” and “B” scales. (See
fig. 3.) These graduations always represent minutes
and are equal to five or ten minutes as shown by the
arrows. For example: between 1:50 and 2:00, the gradu-
ations are equal to five minutes; and between 2:00
and 2:30, the graduations represent ten minutes.
The graduations on the “C’” scale are very large in com-
Parison
with
those
on
the
“B”
scale.
As
a
result,
there
are
times
when
finer
graduations
are
needed
than
are
Provided
on
the
“C”
scale.
When
this
happens,
the
smaller
graduations
on
the
“B”
scale
can
be
used
to
supplement
the
measurements
on
the
“C”
scale.
For
example:
in
figure
4,
the
graduations
on
the
“C”
scale
are
equal
to
ten
minutes,and
the
graduations
on
the
“B”
scale,
immediately
above,
are
equal
to
two
min-
utes.
Starting
at
the
left,
the
values
are
3:30
on
the
HOURS
ON
C—SCALE
MINUTES
ON
B—SCALE
36 3:38 340
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Figure 4