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F
;
F
Calculations
are made
by turning the handle
rVhen
the
required numerals
have
been set
up
in
the
machin
e, you
can
add, subtract,
multiply or divide
by
a
few turns of
the handle.
$7hile
the crank is
being
turned
it
is
neces-
sary
to pull out
the
handle
(as
shown
by
the
arrow) and
keep
it
pulled out
until
the
required number
of
turns have
been com-
pleted.
All
turning movemen*
should
be
carried
out
smoothly and evenly,
not
by
jerks.
The
crank
is
locked
in nor-
mal
position-
#
Pulling
out
the
handle
in
the
direction
shown
by the arrow
unlocks
the
crank,
Crank forwards (positive turn)
to
add,
and
backwards (negative
turn) to
subtract
a
number,
whichever
the
calculation
re-
quires
A
negative
turn
cancels
a
posi-
tive turn
and vice versa-per-
rnitting
instantaneous
correction
oF
cranking
mistakes.
After
cranking the
necessary
number
of
turns the crank must
be
ser
in
its
normal resting position before the
mechanism
can be
cli:arecl
and
a
new
calculating
operation
begun.
h
)
E
r
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