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