furning
the cronk
perlorms
the colculotion
Once
you've
set up the figures
you
can
add, subtract, multiply
or divide merely
by turning the crank.
To turn, first
pull
out the
handle
(as
indicated by arrow) and keep
it out
until the required
amount of
turns have been complered.
AII turning movements should be carried
out smoothly and evenly, not
jerkily.
Pull;ne out tle handle in the
dne.tion
slown by the rrrow
Crank
forwards
(PositiL,e
twn) to add, and
backtoards
(negdtioe
turn) to sabtract a
number, zohicheuer the calctlation reqairts.
A negath.te
turn
cancels
a
positi,tte
tum and
oice oersa-permitting instantaneous correc-
tion ol ctanleing mistahes.
After cranking
the necessary number of turns the crank must
be
returned to its neutral
position
before the mechanism can
be cleared
and a new calculating operation begun.
6
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