FRIDEN STW - Page 9

Be5-50
FRIDEN
CALCULATING
MACHINE
CO.,
INC.
Page's
HOW
THE
MACHINE
WORKS
tion
of
this
process,
put
the
number
125
inthe
Main
Key
Board,
depress
the
Plus
Bar
and
turn
the
Drive
Shaft
slowly
by
handcrank.
Note
as
the
revolution
of
the
Drive
Shaft
progresses,
the
num-
ber
125
appears
in
the
Accumulator
Dials.
With
the
same
number
in
the
Key
Board,
again
depress
the
Plus
Bar
and
rotate
the
Drive
Shaft
by
hand
crank
and
the
number
250
appearsin
the
Accumu-
later
Dials.
Why
did
not
the
number
2
4
10
ap-
pear?
This
last
demonstration
brought
into
play
another
feature
of
Accumulation
known
as
Trans-
fer,
Thus,
when
the
5
and
5
were
added
together
the
1
of
the
result
10
was
automatically
trans-
fered
ta
the
second
column
and
added
to
the
4
in
that
column
so
that
it
became
5,
and
the
correct
result
250
appeared
in
the
Accumulator
Dials.
E.
TRANSFER:
The
Transter
mentioned
above
is
accomplished
by
the
action
of
a
Cam
on
the
bottom
of
the
Accumulatar
Dial
Shaft
and
is
lo~
cated
just
above
the
Accumulator
DialGear.
This
Cam
actuates
the
Transfer
Lever,
which
in
turn
moves
a
Transfer
Gear
downward
on
the
Add~
Subtract
Gear
Shaft
next
order
to
the
Left.
This
action
moves
the
Transfer
Gear
into
position
to
be
acted
upon
by
the
Transfer
Tooth
on
the
Actu-
ator
which
rotates
the
Transfer
Gear
one
tooth,
andinturn
causes
the
Accumulator
Dial
to
regis~
ter
an
additional
digit.
Allthis
actiontakes
place
after
the
rotation
of
the
Selecting
Gear
is
com-
pleted
in
that
column;
so
there
is
never
any
in-
terference
hetween
Selection
and
Transfer.
The
Transfer
Gearis
restored
to
normal
position
by
the
Restore
Cam
on
the
Actuator.
You
will
note
that
numbers
continue
to
accumu-
late
in
the
Upper
or
Accumulator
Dials
until
the
end
of
the
operation
being
performed.
These
numbers
will
remain
‘‘stored’’
in
the
Accumu-
lator
Dials
until
cleared
out
or
‘terased''
to
be-
gin
the
next
operation.
F.
COUNTER:
The
Gounter
inthe
Friden Calcu-
lating
Machine
is
for the
purpase
of
recording
the
number
of
calculations
made
in
any
one
prob-
MODEL STW
PRIMARY
PRIMARY
CLEAR
TRANSFERING
seeeos
pongo
oe
=e
SS
SECONDARY
SECONDARY
SECONDARY
CLEAR
BLOCKING
TRANSFERING
lem
and/or
accumuleting
the
number
of
opera-
tions
made
in
a
series
of
calculations.
The
prin-
cipal
use
of
the
Counter
is
in
division
problems
where
the
number
of
calculations
made
by
the
machine
is
the
quotient
or
answer.
There
are
other
uses
for
the
Counter
such
as:
checking
for
the
correctness
of
multipliers,
number
of
items
in
addition
or
subtraction,
and
other
applications
of
the
machine.
Observe
the
construction
of
the
Counter,
how
the
Teeth
are
assembled
on
the
Counter
Shaft
and
the
slight
amount
of
Spiral
necessary
to
prevent
errors
in
Transfer
from
one
Counter
Dial
toan-
other.
Study
the
above
drawing
to
note
how
this
Spiral
works
in
connection
with
the
Blocking
Cams
on
the
Counter
Dials
so
that
only
ONE
Secondary
Finger
may
touch
a
Blocking
Camatany
one
time,
how
the
Secondary
Finger
moves
into
the
Slot
in
the
Blocking
Cam
to
effect
a
Transfer.
Study
the
Counter
action
in
the
machine.
DIVISION:
In
mechanical
calculating
machines,
the
process
of
division
makes
use
of
both
sub-
traction
and
addition
due
to
the
mechanical
pro~
cess
necessary
to
determine
the
difference
in
the
size
of
the
figures
involved.
That
is
to
say,
the
machine
will
subtract
one
time
too
many
in
that
particular
column
to
determine
thatit
is
ne~
cessary
to
shiit
the
Carriage
into
the
next
column
where
the
process
of
subtraction
will
be
continued
until
the
completion
of
the
problem.
When
this
happens,
the
machine
knows
that
it
has
made
an
overdraft
and
hastens
to
correct
that
overdraft
by
immediately
adding
the
last
subtraction
back
into
the
Upper
Dials,
after
which
the
Carriage
is
automatically
shiftedinto
the
next
column
to
con-
tinue
the
operation.
Therefore,
in
division,
the
machine
ts
continually
subtracting,
adding
and
shifting
the
Carriage
through
the
whole
operation.
G.
SELECTION
-
MULTIPLIER
KEY
BOARD:
Study
the
next
illustration.
Depress
the
Numer-
al
1
Key,
follow
its
action
down
through
the
Key
Board
to
the
Setting
Lever
and
to
the
Setting
Pin
in
the
far
rear
position
in
the
Setting
Pin
Board.
Note
that
the
Number
|
Pin
is
pushed
upward,