Facit NTK User manual

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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
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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
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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
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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.
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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"
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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
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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