Facit NTK User Manual

T',

w'

,

t

Manual

for the

calculating machine

model

1{TK

A.KTIEBOLAGET

ATVIDABERGS

INOUSTRIER

STOCKHOLM

.

S\TEDEN

Contents

Preface

Tne

ieatures of Facit NTK .

The

x-orking

parts

of the machine

.

.

.

The3registers...

Ciearing the registers

Onlr 13 setting

keys

.

Thecarriageshiftker.s.

.,...;,,..

The tabulator ..,

Calculations are made bv turning the handle

Positive and negative

turns

.

The position indicator

Set up the figures with

your

left hand, turn handle

with right .

.

ivlarking

the decimal point

.

Care

of

the machine

.....i

The machine is foolprooi

.

.

.

Addition
Subraction
Multiplicat

Division

10n..

3

4

5

6
6

7

8

8

9
10
10

11

1,2

LJ

1,4

1,5

t5

1,6

t7

l

I

{

I

)

Addition and

subtraction of numbers consisting

of

more than 9,

but less

than

13

digits

.

.

.

.

18

Subtracrion

below

zero ,

... 19

Short-cutmultiplication... ..,.,..20

N4ultiplication involving

addition of products

,

.

, , 2l

Continuousrnultiplication....

....21

Divisionbymultiplication,

...,.,.22

Rule

of three

.

..... 23

Reciprocalvalues

....24

q

l-=-

The

#&ffiEY

ruYffi

masters

all the

4 rules

of arithmetic

by means of

10 setting

keys only

The

Facit 1O-keyed calculating

machines

have

in

a

few

short

years gained

a

ver\-

strong position

on all the markets

of the world by

reason of their

first class

qr-rality

and

reliability,

in

addition

to the

r-rseful calculations

which they

are capable

of handling.

As will be

shown in

this

manual the

Facit

NTK

is extremely

easy to operate once

]'ou

have gained

knowledge of the

correct way

to

go about it.

For this reason

it is really worth

while

to study this little book

thoroughly

before

commenc-

ing

any

work on the machine.

l
I

f

I

il

I

li

,T

!:

B

r&EIT

ruTK

at

your

service.

. .

-\nr-one

n ith

a prer-ior-rs

knowledge

of calculating

machines

s

il1

be

interested

to

note

ihat

the

Facit

NTK,

in

addition

to

the 1O-key

sysrem.

also shows

the following

features:

o'erall

tens

transmission

in the product

and

multiplier

registers,

n-hich

facilitates

shorr-ciits.

gives

immediate

readings

and ensures

complete

reliabilrn-;

direct division

setting

*-hrch

saves

brain rvork

and

increases

speec{;

rapicl

zero

clearing

$-hich

qrerrtiy

speecls

up operrltion.

lr

2)

l)

Learn

to know the

working

parts

of the machine

.

Clearing lever

for

product

r.egister

Clearing

lever

for

multiplier

register

Handle

Clearing

lerer

for

setting

regisrer

Carriage

shift keys

for

step

movements

Setting

keys

Tabulator

In

the above illustration,

which

shows

the machine

as seen

from

above, the

various

operating levers

and keys

are easily

recogntzable.

Try to

memorize their

names-that

will help

you

to get acquainted

with

the machine

and its

operation

in

a short time.

iD

IiL:rririier

The

Product

register

-::

.',:::::rr:t.

subtrlctic;t

:::r ::--:-:t----i-

.-.:

::.-

.:;

.qJr

si:-

:.

, r:

-

.

-

-

-

::-:j-:

reqi.ter.

Th:.

r:ii::;r

al;o

..-t.,

a.. ;cilt.tinde:

.:::

::..-:

.:

-:.-.--

::-:.

The

Setting

r€gisrer

I.:rr

1'-1nlg131

deprcsscd

b,

t:..:,-:lln:

.,

.

. i.rrrr

r-di,rrclr

.:.t

r:.

i:_

r

-

..::-:

: :.:l,tcr.

The

Multiplier

register

I.n

.rdrli.riorr

,h,

rrrL.lr iplicr

r-r,-i\r(r

srrowi

llrc

r:-::

b.,r

oI

ilcn,:

a.{d.d

to3ctlrrr'.

lrr rrru'riplication

rhu

irrulri-

plicl

appcer'.

iir

rhi.

r.egi'rer.

In,divi,jorr

rhu a.t)wcr (rhc

rlur;rirrrrl

ls

shown

i1ere.

f

bt tr'n,t,

tntl .'o)

-d

iur

thc

Ir,rtr

rulct

ol artiL.bt,tcti.

.tti

to bc

i<rt,nd

o,t

the inside

real coLar.

Ciearing

the registers

Each

of

the

three

reqisrers

has

its

owl1

clearing

lever.

Rc-

member

to clear

all

the r

egisrers

after

each

complered

com-

putation.

This is

done

in

the

following

manner:

\\

ith your

lclt

hand

prcss

dorvn

the

lcft

h.rnd

clearing

lever,

.1ncl

with your

rigl-rr

press

the

trvo

clearing

lclcrs

togcthcr

against

c;.ch

other.

ti

are

depressed

according

to the

numbers

on thc

keys

and in

the

order in

which

they

are read.

Exanrple:

The numbcr

1365 is

to

be

ser

up.

First press

down

the figurc

1,

then the

3, the

6, ancl

tJre 5.

For

cach

key

clepressed,

the corresponding

figure

will

appcar

in

the scming

register"

i

Cnly

3{i s*tfi:i:g

}eeys

fsvl

t'!:t:l:

r,,: e .ti;.ifrtit:*i

_fr::

,ii!

ralcc;lafiarcs

l,

The

numerals

to be used

ii

l

I
I

I

Setting

registcr

The

c:iiiaQe

shift

ke1's

-.':,-.:.

-

t',.;r:.ritisnt.

'rnd

with it the

set-uP

ttumerals

itr

:,:e

'-::i,ri

resister.

are

mor-ed

step

b1-

step

to the

right

or

-e-:'r,

means

oi

the

red

carriage

shift

ke1's'

The arrow

o11

rr;

^ei

s indicates

the dire

crion

in which

the movement

takes

-.''-:;e,

'.l

ir c

lcit

l:

-,.:

kcl

n:tr:-.'r:l:

t1uil1!'1'i-S

:rrr,

lei:.

ti :

J rai

f:f, i

,rI:

ff

::l a

fhc light

liand sltift

Iev

movcs thc

nu-

,ncrals to thc light.

The tatrulator

Bi

:r single

depressio,

of

the

red tabulator

ker

(to the

r:ight

o11 rhe

keyboard)

the

setrir-rg

carrier

is

bror-rgl-rt

to

rhe

left as

far

as

it vrill

travel,

and

tl-iis

is thc

LisLIal

p1'ocedure

for

dir.ision.

At thc

same

timc

t1-rc set-up

llumbcr

;..urrtlctcd

witlr

rtot,ght'

il ir corr-

i.rirr. li's

th.rir

6 digits.

Scc

illtrrr.r-

tion,

s

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

I

I

l.

Positive

and

negative

turns

The number

of

mrns

made

is shown

in

the

multiplier

register.

Tl-is

has a

turn

direction

indicator

which

shows

red

for

negative

coupling.

Positive

or

negative

coupling

is

determined

as soon

as

the

crank

has

been

turned

about

half

an

inch

in

the

positive

or

negative

direction,

irrespective

of

urhether

the

turn

is

completed

in this

initial

direction

o,

,l.rr.d

and

complered

in the

opposite

direction.

A turn

that

has

bem

initiated

more

rhrr,

,o

inch

must be

completed.

Negative

coupling

is discontinued

when

the

register

is

cleared

with

the clearing

lever.

The

multiplier

mechanism

counts

the

number

of

positive

twrns

when

the

first

and

following

rurns

are

positive.

It counts

the

number

of

negs.tioe

turns

when

the

first

and

following

turns

are

negative.

If

positizte tarnt

dre rnad,e

witb

a negatirte

coapled

regitter,

it

counts

backw.rds,

that

is

ro

say,

it

akes

off one

for

each

turn.

If

a start

is made

with

noughts

alone,

or

the

zero line

is

passed during

calcula-

tion,

the

complement

of

the last

number

registered

in the

multiplier

r.girt.,

is

obtained

automatically.

(Complement

of

1:999999999.)

The

turn

direction

indicator

on

the

muitipli"r

register

-showing.

that

the

machine

is ready

lor

negattve

opera-

tion.

The

position indicator

The

red

position indicators

in the

multiplier

and

product

registers

are

co.rtrollei

by

the red

shift

and

tabulator

keys

and

thus

indicate

in

which

column

position the

machine

operates

at the

moment'

Product

register

I

lo

Multiplier

register

D

E

Set up the figures

with

your

left hand

-

turn the handle

with

the right

The illustration shows

which fingers are used to

press

down

the

various

set-

ting keys

according to

the

touch

system for

which the

machine has

been

designecl.

By

practising

this

system right from the start

you

will very sool1

learn

how

to calculate

speedily

and correctly. You

will find that after

a short

period

there

is no need for

you

even to look at the keyboarel,

just

like a trained typist who has no need to watch the keys.

By

this

left

hani{

system the right hancl is always

free

for the recnrring

turning

movements

and elearing operations as well

as for

making

n0tes"

h

)

Ir

F

t

ll

Decimal

point placement

The

decimal

pointers are

position-

ed at

the register

windows. They

are displaceable

and

provided with

an

"eve".

Position

the decimal

pointe'.

so that

the figure

in

the

"e1-e"

marks

the number of

de-

cimals.

Example

ol decimal

point

posi-

ticning

in division:

33.769

_

| )

1s.14

How division

is done with

Facit

NTK

is described

on

page 17. After

the

dividend

(33.768) has been

set

up

in rhe

product

reqister,

set ont

the decimal

point.

-

The

"eye"

shows

1 1. After

the divisor

(28.14)

has

been set

up and

moved

over

to

the left, the

decimal

point is

read

off for

this number.

Note

that

the

number

now

has two

noughts

after

it, so

that

the sett-

ir,g

up register

shows 28.1400.

Tliese noushts

are also

counted

as

decimals,

i,hi.h *.un,

that there

are

4

in

all.

The

di{ference

between

11

and

4 is 7.

The mul-

tiplier

register

decimal

points

musc therefore

be

positioned so

that

the

"eye"

shows

7. The

result

ol

the division

is 1.2.

t

f

\

Rwles

t'or

decirnal

point

Addition and

subtraction.

?osition

the decimal

point

identically

in

the setting

and

in the

product register. Set.up

all numbers

with

the same number

of

decimals

so that

they come

right relative to

the

decimal

point

in the

setting

register'

lvlultiplication"

The number

of decimals

in the

product register

is to

be the sar-ne

as

the sum of

the

decimals

in

the

serting

up and riilltiplier

registers.

Mark

the

position of the

decin-ral

point in the

product register according

to rule

before

starting calculation.

Division.

The

number of

decimals

in

the

multiplier

register

is

to

be the same as

the difference

between

the number

of decimals

in the

product

and

setting up

registers.

You can

avoid unnecessary

calculating

work

if you

determine the

position of the

decimal

point

and

how many decimals

are needed

in the answer

(quotient;

before

you

start

to divide.

See also the example

at the top of

the

page.

t3

i

t

4

t

Look upon

your

new

Facit

NTK

as

a

carefully

manufactured

instrument

. . .

and treat

it

accordingly

The

FACIT NTK

is a

precision

machine

throughout.

It

is

designed

and built

to

give

perfect

service

for

many years. Regular

attention

will

guarantee

good

and

reliable

service.

Unlike

the majority

of

calculating

mdchines

the FACIT NTK

is

entirely

enclosed

and

thus

protected

against

dust.

Naturally

the

mechanism

will be

subject

to

wear as

the

oil is

gradually consumed.

Like

needs

cleaning,

oiling and

adjusting

now

and

then.

This should

be done

once

a

year,

prelerably by

e serviceman

approved

by

the makers.

Obviously

the maker's

guarantee will

be

rendered

inoperative

if

the

machine

has

been

oilecl

or repaired by unskilled

iabour.

a

certain amount

of

all other machines it

B

t

h

TB

The machine

is foolproof

Tbis

rneans that

yow

can never

carry

out two simwltaneous operdtions

by

mistake.

The machine is so

designed

that it

automatically opposes every

manipulation which might

jeopardize

the reliability of the calculation

or

possibly

damage the

mechanism.

Never ty to force the machine if it

jams.

Jamming

indicates

thet

some

of the operating

parts

have locked-these

must be restored to

normal

position

before

you

can resume calculating. Most

of the time

you

can

unlock

the

parts

by

clearing

all registers

or setting

the

handle

in its original

position.

If these measures

fail,

you

should

get

I

"t

in touch with an authorized FACIT mechanic.

a

d

{

,{P

L

I

{f

t4

I

'';ilri=,

&ddition

l.xanpLc: 3178 139,1

I [J5 I

8962 ?

'

->::aJ3

Set tip the

first four numerals

by clepressins

the

appropriate

kevs'

Make

one forward turn"

Frc, the

setting register

thc

nttmerals

will then be transferred

to the

product registcr,

which n'i1l sholr'

Clear

the

setting

register.

Set

up the next

numerals,

394, and

make

a forn'arcl

turn.

The total

of thc

two sets

of

numerals

will then

appear

in t1-re

product register

i!:

1,1

l;:i::,:;

,.1

i;

I

fi

t

b

,}

Clear

the

setting register

once more

and

continuc

to

remaining

items.

If

you have

set uP

the figures

correctly,

trct

register

will show

the total

sum to

be

The multiplier

register,

at the

same

t

add

the

the

procl-

time,

records

that

,voti

havc

added

4

items in

all

[GEryFqL

:-}

Clear all

tbe registers

when

yotr. hate

c <trnple

ted

the c alculation.

Subtraeti*m

Example:

276543-80927

:

?

Set

up the

numerals

276543.

Make a

forward

turn so

as to transfer

the figures

from

the setting register

to the

product

register.

Clear

the

setting register.

Set

up the lesser

number,

80927' Make

,r backu,arcl turn

and i:eacl

off the

resi"rlt

in

the

procluct

register.

This

number is

the

clifference between

276513 a.ntl

80927.

Clear all. tbe rcgisters

wben

yorl

hau compl.ete

tl

tbe calculati.ort.

,l

?

B

l5

Muitiptricaticn

Example: 6943259'/.20'13

:

?

Set up the

greater factor 6rq43259. Make 3

forward turns.

The

multiplier register now

shor.s

The product register shos,s

(69,13259X3)

Press down,

once

only,

the

left

hand

carriage

shift key

ffi

This will cause the carriage to

move one

step

to

the

left, which

is

also

recorded by the

position indicator. Now make 4 forward turns.

You have now

multiplied

bv

43. Look at the

multiplier register;

ir shows

The

product

register

shows

Press the left hand

shift

key

twice

ffi

(passing the figure

0 in

the n-rultiplier) and make 2 for*,ard turns. You have now completed

the multiplication and can read the answer

(the

product)

in the

product

register

The

setting

register shows the rnultiplicarrtl

The multiplier

register records the

multiplier

In

this

v/ay yolr are

able

to

check

that the correct manipulations

have treen carriecl out.

Clear all the regi,sters when

you

ha'oe completed

the calculrttion.

tli

I

I

3

a

a

t

flivisicr:

[.xam

pla: 9955

I 28 : 302

:

?

Sct up

thc

dividend

9955128 by the

sctting

heys. Press

lator

ffi.

Transfer the

setting to the

product register

by

turn, thcn clear the setting

and

multiplier registers.

Set

up the divisor

302 by

the appropriate

keys.

Press

lator

ffi.

Make

backward

turns until

you

hear a bell

then one forward turn.

The product register

will now show

and the n-iultiplier

register

Press the right

hand shift

kev

ffi

orr.. and

continue with

back-

ward turns

until

the

bell rings,

then one forward

turn. The

prod-

uct register now shows

and

the

rnultiplier

reglster

Depress the right

handle

backwards

Now the

product

multiplier register

Once

again

depress

the right hand

shift

until the bell

rings, then one

forward turn.

the

tabu-

a forwarc'l

the

tilbu-

ring ancl

ffi

or-t.. more

and turn the

rings, then

one turn forward.

an d thc

k.yffi

,

crank

backwarcls

The

product

register

shows

hand shilt

key

until the bell

register shows

t@l

a,d the

multiplier register

Again

press

down the right

hand

shift

k.y

ffi

and continue

back-

x'arci

turns

until

the

bcll rings,

then a

forrvarcl turr-r. Thc

product

register now

shows nothing but noughts.

Thc divisior-r

coulcl be com-

pleted

without leaving

a remainder.

The answer

(quotient)

is

recordccl

I

F

in

the

mr.rltiplier register

Clear all the

registers

when

yott.

have completed

the calculation.

t2

Addition

and subtraction

cf

numbers

consisting

of more

than

9,

but less

than

13

digits

[,i,i,it]tlt':

57 E3)

L)65

7E2 155

E79 6n

rc3-5

289

1i3 2n

:::i

?

Stt

r.ip

as na11,v

of

the

iirst figures

of thc nurnber

as thc sctting

rcgister

can hold

(9

irgures).

The two last figures,

thercfore, havc

to

be

left or.it. Depress the

left hand

shift

key

Q

twice

(or

as lnany

times as

there are remaining figures

in

the

number).

\Iake

a fors.ard

turn.

The product

register

shc*'s

Clear

the settir-rg register.

Norr- set

ancl rrake

a forward turn. The

up the two remaining

figurcs, [i2,

product

register

now shows

thc

complete

number

C1e:rr

the

setting

register.

Set up thc first

9 figr.rrcs

in ti-rc ne

xt

irurnbcr.

Press

the left hand shift kcy

tl

thrcc

tirnes ancl

mal'c

r.r

torr

;rrcl turn. Tlle

proclnct

register nclrv

sht-,rvs

Clcar

the setting

registcr. Sct up the threc rcrnaining

figr"rres, 1.63,

and

rutrkc

a forward

turn.

Thc procluct

register now

sl-iows thc

tetal

sunr

of tl.rc

trvo ;rclclcel

riiimbcrs

Cle,rr thc

ta

sctting

register

again. Scr

Lrp rhc first 9 ligurcs

uI

thc

next number. Prcss

lcft han,1 sLitt

licy

H

cncc

antl

tralic a

tracli-

rvard turn

(subtraction).

Clcar

the

sctting

register, set

up thc rcmaining

figurc

3, attcl

makc

olre more backward turn,

Thc answer

to the

cntirc calculirtior,

is now

rcady and appcars

in thc

procluct

register

Subtraction

below

zero

[:.xarnpLc:

57-681

34-136

:

?

Set up the

register.

Set

now shows

number

57.

Give

up

58.

Make

one

one forward turn.

Clc;rr thc sctting

backward

turn. The

product

register

Clear

setting

register and

set

up

forward turn.

Product

register shows

Clear setting

register

aird set

up

Iv{akc

a

136.

Give one negative tur11.

Product

register shows

which is a conrplcnrc,,t-

ary number

inclicating

that the result

is a

negative nut.nbcr. To rc;rcl

oltf the

answer, clear

the setting

register ancl set

up threc nirlcs

imrnediatcly

followed

by 887

(the

number found behincl

the nircs

in the

product

register).

Turn the

handle twice bacir*'arcl.

Thc

procl:

uct rcgister

now shorvs

The ;ursrver

is

-113.

the next

number, 34.

w

Thc digits to

thc lcft

of the noughts arc

of uo

irnportaucc.

l9

Short-cut

multiplication

If the

multiplier contains

figures

of

a

higher value than 5, .for

example

8,

it

saves

time to use the

so-called short-cut

multiplication

nrethod.

This

is

performed by first'moving

the handle

t'rom

its

original

position

about an inch

in the forward

direction. You then

bring forth the

8 by

making two

backward turns. The multiplier

register to the left

of the

position

indicator

will then be filled by

nines.

In order to remoye

these nines

you

press

the left

hand

shift key

!l

or.. and

make a

forward turn

(8

being the sanre

as

-2*

iO).

By saving all

the turns

required for the

operation in

the

normai

way of multiplication

you will effect a

time-saving of up to

40

oloby

using short-cuts.

If,

instead,

you move the

handle

at once in the

negative direction,

there will appear

to the righc

in the multiplier

register a red dot

which

indicates

that the

register

is set for minus

or negative opera-

tion.

If

this

is the

case

you will have

to

clear

the rnultiplier register

and

the

product

register and

repeat the

operatioir.

Example: 758X819

:

?

Sec up 758 by

pressing

the setting

keys.

Move

the handle about

an

inch

in

the

forward direction

and then

make a

negative turn, Thc

rnultiplier register will show

a row of

nines.

Press the ieft

hand shift key

!

and

make two forward turns so

that a

figure 1 appears in

the muitiplier register.

Press the left

hand

shift

key

tf

and

make two backward

(nega-

tive)

turns,

3{}

XTK.

E'

F

{

Depress

the left

hand

shift key once .nore

S

and make

one

positive

turn. The

product

register

now

gives

rhe answer,

which

is

You

have

completed

the operarion

by 6

yotr

multiplied

in

the

ordirrary

manner it

to get

the

same

result.

Multipiieation

involving

additisn

of

produets

turns of

the handle.

Had

woulcl irave

taken

18

tums

Example:

2495X374+4694\38

:

?

The nrultiplication

2495X374

is performed

in

the ordinary

manner.

The product

register now

shows

Clear

the

setting and multiplier

registers.

Multiply

4694by 38.

amount of

the two

multiplica-

Continuous

multiplication

\/

(@x"A

Example:

127X12X31.1

:

?

The multiplication 127X12

is

performed

in

the normal rvay.

The

product

register

shows

t@l

Clear the setting register. Set up

the

obtained product,

1524,

ancl make

a backward turn, causing

the product register

to show nothing

but

noughts.

Clear the mtiltiplier

register. Multiply 1524

by 311.

The

proclucr

register

shows

the

answer

(ffiffiffi]

3l

The

product

register shows the total

Division

by
rnultiplication

Examtrtle:

672:28

:

?

Division

can be

clone

irr

two ways.

The

most

commoll

n-rethod

fias

been

described

previously.

You can

also

divide

by

multiplying

the

divisor

(28)

as

many times

as reqtrired

to

reach

the value

of the

dividend

(672).By this

rnethod

),ou

gain

the advantage

of being

able

to

read

off the

answer as

well

as dividend

and

divisor,

each

in its

appropriate

register.

Set

up

2g.

press

tabulator

El

and

conrinue

with

positive

tLlrns

until

the number

in the

prodr-rct

register

as

near as

possible approaches

the

first

two

figures

of the

dividend

(67)*. After

two forward

tttrns

the

figures

56

will appear

in the

product register;

after

three, the

figures

84.

You therefore

stop

after

two

turns.

press

the

right

hand

shift

kev

tf

and

keep

turning

the

hanclle

forward

until

the

factor

in the

product

register

comes

as

close

ls

possible

to,

or equals,

the

dividend

(672).

After

4 turns

the

product register

shorvs

the

diviclend

The setting

register

shows

the

The

multiplier

register

shows

': The

corresponding

rumber of

'D 'D

divisor

the answer

a

figures of

the divisor,

in this case

two

Rule

of three

The

rule of

three is

the

narne

of

a calculating operation,

which

may

look

as follows:

)5575Y 435

L,xatn\le: -

-

?

-

725

First you

set

up

the

largest

factor

of thc dividend (above

the

line)

preceded

by

a O, thus

035875. The nought

is introduced

to

keep

yotr

from

exceeding

the capacity of

the machine. Press

the tabr.rlator

tl

.

It

will

be

seen

that the

position

indicator

is now

ser

to the extrernc

left

in

the multiplier

regisrer,

and consequently

you

carry

out

the

multiplication

by

the figures 435 in

the order

they

appear,

t'rom

let't to rigbt in tbe mwltiplier.

You

therefore

multiply first

by

4.

Then

press

.shift

key

tt

and multiply

by 3.Press

right hand

once

more and multiply

by 5.

The

multiplier register

shows

To

tire

left

in the

product

regisrer,

you

no'\!, ger

which

is

your product.

Clear

setting and

muitiplier registers.

Set up

725. As thc first

figurc

of the

divisor is

greater

than thc first

figure of

the

dividencl one

nought

is

set up in front

of the

clivisor. This rvill givc

rirre

nrore

dccirlal

in the

answer.

'Ihe

nought

in front

of the number

Press

the tabulator

l!

and

carry

The

multiplier

register records

the

answer

If

thc division

is uneven,

there rvill

be

than the

divisor and

it will

be shown

in

the

the

right hand

shift key

If

15 not necessary,

out

thc division

ir.r thc risual

way.

a reilainder

wJrich is

lcss

product

register.

3:l

a

Reciprocal

values

By the

expression

reciprocal

is meant:

1 divicled

by a

nun'rbcr

values

1.

or, expressed

in fractions:

r-rumber

ExamPle:

,',

-

?

This

operation

can

be carried

out

as an

ordinary

division,

but

thc

simplest

method

is

the

following:

Set up

98. Press

tabulator

!

and turn

handle forward

until

bell

rings,

in

this

particular case,

two turns.

You will

hear

the bell

at

the

second

turn.

This indicates

that

you have

gone

a

turn

too

many

and,

therefore,

you have

to make

a

negative

turn.

Press

the

right

hand shift

k.v

lI

once and

make

a forward

turn.

The

bell

rings

and

you

therefore

give

the

handle

a backward

turn.

Press the right

hand shift

k.y

B

again

and

continue

in this manner

until

the

multiplier

register

has been

completely

filled

with figures.

The

answcr

rvill

appear

in the

multiplier

register

and is

a

The decimal

point is

positioned

according

to

the following

rulc:

pur

in

front

of the

answer

you received

in

tl-re

multiplier

registcr

as

many

nougths

as there

are

units

in

the

original

number,

in this

case two

noughts.

The

first of

these

is the

unit

nought. The

answer

is

therefore

0.010204081'

3t

NTK.

E.

Remember

these arithmetical terms

Tbe

t'our

rtles of arithmetic

+ Addition

addendum *

ad.dendum

:

total

-

Subtraction

rninuendum

-- swbtr abend

:

remainder

X Multiplication

rnultiplicand

X multiplier

:

prod.wct

The mulriplicand and multiplier

are also called factors

-i

Division

dividend.:

diaisor

:

quotient

Dividend and divisor can also

be expressed thus:

diaidend numerator

and are then called

diaisor enominator

If the numerator consists of

2 factors,

the term is rule

ol tbree:

factor X f4ctor

(numerator)

-

divisor

(denominator)

quotrcnt

ET

{

.',i

'.,i

Thanhs

for

j,,owr

interest

!

In

more

ways

than

one

the

Facit

calculating

machine

will

save

you the

time

you

have

spent

reading

this

little

book.

I

rHB

7

E. lO M.5.54

I

L

'1

pBrilTED

rN sfiEDEN

BY

AB TEYcKsATsREKLAn.

sruru

/

sonesrndMs'

MoTALA

1954

,.1

I

',1

*,

i

&

j