Monroe Hand Operated LN User manual

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OPERATING
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OPERATING INSTRUCTIONS
MONROE
CALCULATING MACHINE
Hand Operared LN Models
NR
MONNOE CALCULATING MACHINE COMPANY, INC.
General OIIices, Orqnge, New lersey

Copyright 1953
Monroe Calculating Machine Company, Inc.
Printed in U, S. A.
1045-S
September 19JB

FO R EWO RD
,T1 UtS BOOKLET describes the operating controls
I the Monroe Model LN Calculator and gives step by
tions on the four basic arithmetic functions; addition,
multiplication and division.
and parts o{
step instruc-
subtraction,
The directioos apply to both the 8 and 10 bank LN type Moruoe
hand operated machines. The former model has an eight column key-
board, eight places in the upper dials, and sixteen places in the
lower or result dials. The latter, Model LN 200, is equipped with a
ten column keyboard, ten places in the upper dials, and twenty places
in the lower dials. The actual operation of these two models is
exacrly the samel the only difference is in their figuring capacities.
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CONTENTS
Description of Operating Controls and Parts
Addition and Subtraction
Multiplicatioo . . .
Division
Decimals
Addition and Subtraction of Decimal Numbers
Multiplication of Decimal Numbers
Division of Decimal Numbers 20
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MONROE
CALCU LATOR
Model LN
OpercrtinE Controls
1. Upper Dials
2. Lower l)ials
l. farriage Shift Knob
4. Clear-out Crank
!. Operating Crank
6. Repeat and Non Repeat Keys
7. Keyboard Qlear Key
8. Carriage Shift Lever

MONROE MODEL LN
Description of 0peroting Controls ond Ports
l) Upper Diols The set of dials located in the upper parr of the
moveable carriage is called the upper dials. These dials show the
quotient (answer) of a division problem in red figures. In multi-
plication, they show the multiplier (number by which you multiply)
in black figures.
2) Lower Diols These are the sixteen (or twenty) dials located in
the lower part of the carriage. The lower dials show the answer in
addition, subraction, and multiplication. They show the renlainder
in division.
3) Corrioge Sh:ft Knob This knob, Iocated at the righr end of the
carriage, is for shifting several places at a time. Simply lift up on
the knob and slide the carriage to the desired position.
1l Cleor-out Cronk This is the smaller crank located at the right
end of the carriage. A forward (clockwise) turn clears the upper
dials, and a backward (counter-clockwise) turn clears the lower
dials.
5) Operoting Cronk The operating.crank is the larger crank located
on the right side of the machine. This crank is used in all opera-
tions on the machine. The operator should clearly understand what
is meant by a forward turn and a backward rurn of this crank in order
to follow the instructions in this booklet.

\ 6) Repeot ond Non-repeot Keys When the rePeat key (key marked
\ ,'R,,) is depressed, any figures set on the keyboard remain down until
' cleared by the operator. When the non-rePeat key (key above repeat
key) is depressed, the keyboard clears after each turn of the opera-
ting crank. The repeatkey rnustbe depressed when performing multi'
plication and division.
7l Keyboord Cleor Key The keyboard keys are cleared in one of
two ways, either by depressing the large square zero clear button,
which clears the entire keyboard; or by depressing the individual
"zero" clear keys at the bottom of each column, which clear keys one
at a time.
8) Corrioge Shift Lever By a half turn of this lever, located at the
left front of the machine, the carriage may be shifted to the riSht or
left as desired. The operating crank must be in upright, or "neutral"
position when shifting.
TO CLEAR THE MONROE MODEL LN
The operator should always remember to clear the entire machine
before starting any new work. Complete machine clearance is a
simple procedure which can be done almost subconsciously.
To clear keyboard - Depress Keyboard Clear Key
To clear.upper dials - Make a complete forward turn of
Clear-out Crank.
To clear lower dials - Make a comPlete backward turn of
Clear-out Crank
NOTE: The operating crank mast be in upright, or "neutral"
position when clearing.
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