User Guides

Click on the links to access the user guides.  I believe them to be out of copyright, but if this is not the case I will remove them if requested by the copyright owner.

These are scanned copies of originals in my possession.  If you would like a higher resolution scan, please contact me at

Multiply and Divide on an Original-Odhner

This manual can be dated quite accurately to 1950, because the featured model range includes Models 127 and 129, but Models 137 and 139 have yet to replace Models 37 and 39.

The manual is applicable to almost any model of Odhner pinwheel calculator,with the proviso that the quick rotor clearing system is located differently on 200 Series machines (see the Original Odhner page for details).

The manual is also applicable to any Odhner type of pinwheel calculator, except that there will be differences in operation particularly with regard to clearing the registers and back transfer (if present).

Directions for the use of Calculating Machines

Another Original-Odhner user guide was produced by the British importer, Gilbert Wood (A/M) Limited.  It includes a number of worked examples peculiar to the British market:

As far as I can determine, based on the specific machines mentioned, the guide dates from about 1950.

Operating Instructons – Odhner_1048/1049

This is a six sided fold-out leaflet (dated 1970) included in the box with the 1048 and 1049 models. Compared with earlier versions, it’s a rather half-hearted effort.

Facit TK Calculator Manual

I don’t actually have a paper copy of this manual, but it was sent to me by a fellow collector.  Given that Facit machines from the Model TK onwards were functionally identical, this manual can be used for any of them (apart from the CM2-16).

Facit NTK Calculator Manual

This manual came with my  1955 vintage Facit Model NTK, and is in fact dated 1954.  It is applicable to all manual (non-electric) Facit machines with very little adaptation.

Facit C1-13 Calculator Manual

This is essentially the same guide as that for the Model NTK, but shows the ‘new’ machine.

More Ways To Get The Most Out Of Your Facit

This booklet is dated 1952, and contains calculation exercises and examples for Models TK, NEA and ESA-0.


This booklet is dated 1963, and is updated to reference the then-current model range of C1-13, CS1-13 and CA1-13.

Der Kurzeste Rechenweg auf der Facit

This is essentially a German version of  Short_Cut_Calculations_With_The_Facit.

Facit CM2-16 Calculator Manual

This manual is dated 1959, and contains pretty much the same examples as in the Model NTK manual, but includes examples of the use of the back transfer facility .

Monroe Calculator LN Series Manual

This manual is dated somewhat later than my Monroe machines, but the LN Series machine illustrated in the manual is identical in operation to the preceding L Series machine.

Monroe Automatic Calculator CSA Model Operating Instructions

I don’t actually have a Monroe Model CSA, but someone might find this useful.

Muldivo Mentor Instruction Manual

This is the instruction manual for the Muldivo Mentor, known outside the UK as the Walther WSR160.  Although fairly brief, it does include a square root algorithm.

Operator’s Manual for Busicom HL-21

This manual is written in a style reminiscent of Japanese camera instructions of the period, but is fairly comprehensive.

Instructions for use – Brunsviga_13RK

This is a fairly comprehensive user guide for the top of the range Model 13RK.  As usual for the British market, there is a selection of arcane conversion tables at the back.

Instruction Manual for the Friden Fully Automatic Calculator Model STW

This manual, dated 1963, is a fairly comprehensive guide to the features of the Model STW.  It is notable that, even in 1963, there is no hint of the revolution that is to come.  However, that begins to change with:

Instruction Manual for the Friden 132 Electronic Calculator 

This manual, dated 1965, gives the features of the Model 132 Electronic Calculator a thorough treatment.  It is noteworthy that Friden were still advertising their electro-mechanical range of machines within the same booklet.

Instructions for the use of the Olivetti_Divisumma_24 Superautomatic Printing Calculator 

This user guide probably dates from the 1960s, and gives a thorough introduction to the capabilities of the Olivetti Divisumma 24. As is often the case with documentation for the British market, there are a number of currency conversion tables in the back of the guide.

The following two-part document isn’t a user guide as such, but it’s an exercise book used by someone who went to a comptometer school.  Unfortunately, I don’t know who this person was, but it was the mother of the person who sold me the 1950s Sumlock comptometer.

Comptometer School Exercise Book Part 1

Comptometer School Exercise Book Part 2


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