John Wolff's Web Museum

Reproduction Calculator Manuals.


High-quality printed reproductions have been made from a number of vintage calculator instruction manuals. The original documents have been scanned at high resolution and extensively edited to remove blemishes, improve legibilty, and correct the contrast of photographs. Most are printed in black-and-white only; some have colour covers; some have spot colour in the text and diagrams; some have full-colour illustrations (as indicated below). All of the manuals are written in English unless otherwise noted. It is hoped that these manuals will broaden the understanding and appreciation of these vintage machines, and so contribute to their preservation. Printed copies can be made available to machine owners for a nominal fee to cover costs and postage.

The manuals are described and illustrated below in alphabetical order. Please use the Enquiry Form for further information on any of these items.


 

Addometer

Addometer Instructions Addometer - Directions (c.1930)
Single page, A4 size. (Original 8-1/2" x 11").

This is a single sheet of Directions for using the Addometer. The instructions cover using the stylus, clearing the machine, and performing addition, subtraction, and multiplication.


Burroughs

Burroughs Calculator Manual Cover Instructions for operating the Burroughs Calculator (1925)
32 pages plus covers, A4 size, comb bound.
31 illustrations, 5 pages of tables.

This is a very detailed and well-illustrated operating manual for the Burroughs key-driven calculator. The illustrations are of the 1925 model, but the instructions are applicable to any key-driven "Class 5" machine, including the later electric models. The manual covers fingering techniques, basic addition and subtraction, detailed procedures for multiplication and division, and examples of many types of business calculations. You should be able to pass the Comptometer Operators' Certificate Test after completing the course of instruction in this manual.


Brunsviga

Brunsviga 13Z Manual Cover Instructions for Use - Brunsviga Model 13Z (1950s)
20 pages plus colour covers, foldout, A5 size (landscape), comb bound.

This manual gives a very clear explanation of the operation of the Brunsviga 13Z pinwheel calculator. It describes the four basic operations (addition, subtraction, multiplication, and division, or ASMD for short), including short-cut multiplication and three methods for division. Examples of more complex calculations include percentages, interest, square roots, and non-decimal units. There are 4 pages of tables for conversion of English weights and currency, interest factors, and grosses. (1 gross = 1 dozen dozen, or 144 items).


Brunsviga 13RK Manual Cover Instructions for Use - Brunsviga Model 13RK (1960s)
36 pages plus colour covers, foldout, A5 size (landscape), comb bound.

This manual is a very clear and detailed description of the operation of the Brunsviga 13RK machine, which includes the back-transfer and coupled clearing mechanisms. The manual is written in the form of a personal tutorial which takes the new user step by step through all of the basic operations and the procedures for typical calculations. It begins with how to turn the handle, and ends with non-decimal calculations, pro-rata, interest, and square roots. There are 9 pages of tables and conversion factors.


Comptometer

Comptometer Instructions 1928 Methods of Operating the Comptometer (1894-1928)
72 pages plus covers, 5-1/2" x 8", stapled booklet.

The instruction manual for the Felt & Tarrant "Comptometer" was first produced in the 1880s, and was progressively updated to cover the new features of subsequent models. This very comprehensive edition was produced in 1928 for the Model J Comptometer, but still contains sections of text from 1894 and illustrations from 1909. Although the Comptometer mechanism changed gradually over the years, the methods of operating were basically the same from the first Comptometer to the last. This manual can be used with any model with only minor adjustments.

The manual focusses on methods of operating the machine in the most efficient manner, with many half-page illustrations showing hand positions and operating techniques. There are detailed procedures for calculations from simple addition to compound interest and square roots, and for the correction of errors via the "Controlled-key" mechanism. There is a section on maintenance and lubrication, and an appendix on the theory behind the use of complements in subtraction and division.


 

Comptometer - Instructions Easy Instructions for operating the Controlled-Key Comptometer (c.1940)
20 pages plus colour covers, 6-1/2" x 8", stapled booklet.

This little manual gives basic instructions and practice examples for calculating on the Comptometer (any model). The book begins with basic 2-finger exercises, then proceeds through various techniques for addition, multiplication, subtraction, and division. It gives particular attention to the setting of decimal points and the proving of results. There are two pages of reciprocal tables for use in division.


 

Comptometer - Cube Root Rule for extracting Cube Root with the Comptometer (1911)
12 pages plus covers, 5-1/4" x 7", stapled booklet.

This little booklet from Felt & Tarrant has two pages of instructions and ten pages of tables to enable the extraction of cube roots on the Comptometer. The booklet is interesting in that it refers to the "Controlled-key" Comptometer, but the copyright notice is dated November 1911. Other Felt & Tarrant publications state that the first Controlled-key machine was the Model E, which was not introduced until March 1913.


 

Comptometer Model C - Repair Instructions Comptometer Model C - Repair Instructions (1909)
14 pages plus covers, 2 fold-out drawings, 7" x 7-3/4", comb bound.

The first section of this manual gives a detailed tour of the internal mechanism of the Model C Comptometer. The second section illustrates all of the major parts and assemblies, and describes how to remove and replace individual parts in a malfunctioning machine. The final section lists the contents of the technician's tool kit and the spare parts kit. There are three detailed line drawings of the mechanism, and three small photographs. The manual is also applicable to the adding and clearing mechanisms of the more common Model F Comptometer. (The cover is missing from my original manual, but a facsimile has been re-created in the style of the other Comptometer repair manuals).


 

Repair Instructions for Model J Comptometer Repair Instructions for Model J Comptometer (1926)
44 pages, 8-1/2 x 5-1/2" (landscape), comb bound.

This technical manual gives a detailed description of the changes made between the Model H and the Model J Comptometers, especially in regard to the carry mechanism and the various springs. It includes a listing of all the new parts and assemblies for the decimal, fractional, and Sterling currency machines, and details of the many combinations of gears and springs for each application. The typewritten booklet has been reproduced via OCR with the original formatting.


 

Comptometer - Model K Servicing Instructions for Servicing - Electric Model K Comptometer (1934)
8 pages, 8-1/2" x 5-1/2", stapled booklet.

This brief technical manual for the electric Model K machines was issued to the Comptometer oilers who carried out the regular monthly servicing at the customers' premises. The manual sets out detailed procedures for intial inspection, full and partial lubrication, and final checks before and after reassembly. There are some general notes on lubrication, and a warning to the oilers not to exceed their authority by attempting more complex repairs. The typewritten booklet has been reproduced via OCR with the original formatting.


 

Compucorp

Compucorp 320 Manual Cover How to use the Compucorp Micro Scientist Model 320/322 (1973)
28 pages plus covers, 7" x 5", stapled booklet.

This is the basic instruction manual for the Compucorp "Micro Scientist" series of portable electronic scientific calculators from the early 1970s. Although labelled for the Model 320 (basic) and 322 (programmable) machines, it can also be used with the 324 (dual program) and G-suffix (Grad) models. The calculating functions are the same for all of these models. The manual is written in an informal style, but covers all of the details including register arithmetic and scratchpad programming.


 

Contex

Contex 10 Manual Cover Instructions for use - Contex 10 (1965)
24 pages plus covers, spot colour, 7" x 5" (landscape), stapled booklet.

This little manual provides much more detail about the operation of the Contex 10 than is found on the brief instruction label under the machine. Contents include basic operations, semi-automatic division, decimal points, continuous and short-cut multiplication, left-to-right multiplication, percentage calculations, and subtraction below zero.


 

Contex 20 Manual Cover Instructions for use - Contex 20 (1963)
24 pages plus covers, spot colour, 7" x 5" (landscape), stapled booklet.

This manual describes the operation of the motor-driven Contex 20 calculator. The contents are otherwise similar to those of the Contex 10 manual above.


 

Contex 30 Manual Cover Instructions for use - Contex 30 (1967)
24 pages plus covers, spot colour, 7" x 5" (landscape), stapled booklet.

This manual describes the operation of the motor-driven Contex 30 calculator with the fully-automatic digit-by-digit multiplication mechanism. The contents are otherwise similar to those of the Contex 10 and 20 manuals above.


 

Facit

Facit TK Manual Cover Manual of the Facit Calculating Machine Model TK (1948)
44 pages plus covers and foldout, 130x195mm, stapled booklet.

This 1940s booklet is the Operator's Manual for the early Facit TK pinwheel calculator, but it can also be used with the later models NTK and C1-13. The booklet describes the controls and operation of the machine and the basic calculating procedures, with examples of typical business calculations. There is a 4-page mathematical chapter on calculating square roots to various degrees of precision, and 8 pages of tables.


 

Facit NTK Manual Cover How to become an expert calculator on the Facit NTK (1954)
24 pages plus covers, colour, A5 size, stapled booklet.

This 1954 booklet is a basic Operator's Manual for the hand-cranked Facit NTK pinwheel calculator. The first half of the booklet explains the controls and the recommended methods for operating the machine. The second half explains the basic calculating procedures. Examples include ASMD, long and negative numbers, short-cut and continuous multiplication, and division by use of reciprocals. The booklet is well illustrated, and has numerous "Facit Man" cartoons.


 

Facit C1-13 Manual Cover Facit C1-13 Pinwheel Calculator - Handbook (1965)
28 pages plus covers and fold-out, colour, A5 size, stapled booklet.

This manual describes the controls and operation of the Facit C1-13, with examples of many types of business calculations and 3 pages of conversion tables. The illustrations are of the mid-1960s model, but the manual can be used with any Facit TK, NTK, or C1-13 machine from the 1930s to the 1970s.


 

Facit CM2-16 Manual Cover Facit CM2-16 Pinwheel Calculator - Handbook (1962)
32 pages plus covers and fold-out, colour, A5 size, stapled booklet.

This manual describes the controls and operations of the CM2-16 hand-cranked machine with the 10-key numeric keypad. It gives particular attention to the use of the back-transfer mechanism from both the accumulator and the counter registers. There are worked examples of many types of business calculations, and 8 pages of conversion tables.


 

Facit NEA Manual Cover How to become an expert computor on Facit NEA (1954)
24 pages plus covers, colour, A5 size, stapled booklet.

This booklet is a basic instruction manual for the Facit semi-automatic pinwheel calculator Model NEA. The manual describes all of the controls and operations, and gives examples of basic calculations.


 

Facit NE Manual Cover How to calculate on the Facit NE (1953)
8 pages, A5 size, stapled booklet.

The Model NE is a cheaper version of the Model NEA (above) without any of the automatic features. This instruction booklet for the Model NE is provided as a supplement to the manual for the Model NEA. The booklet describes the differences between the two machines, and gives revised operating instructions where necessary.


 

Facit ESA-0 Manual Cover How to become an expert computor on Facit ESA-0 (1951)
24 pages plus covers and supplement, colour, A5 size, stapled booklet.

This booklet is a basic instruction manual for the Facit fully-automatic calculator Model ESA-0. The "0" indicates power-assisted clearing keys, but the machine is otherwise similar to the earlier "Electric Super-Automat" Model ESA. The manual describes all of the controls and operations, and gives examples of basic calculations. The 1-page Supplement explains the functions of the secondary control lever.


 

Facit CA1-13 Manual Cover Facit CA1-13 Pinwheel Calculator - Instruction Book (1964)
36 pages plus covers and fold-out, colour, A5 size, stapled booklet.

This manual explains all the controls and operations of the fully-automatic Model CA1-13, with examples of many types of business calculations and 6 pages of conversion tables.


 

Facit examples book cover More ways to get the most out of your Facit (1952)
48 pages plus covers, colour, A5 size, stapled booklet.

This manual provides a broader and more complex range of examples than were included in the basic operator's manuals for the 1950s machines. It describes a range of common business and commercial calculations and shows how they can be done most efficiently on the Facit calculator. Examples include constant factors, simultaneous multiplication and division, pricing and mark-ups, chain discounts, payrolls and deductions, interpolation, interest, English currency, and calculating with very large numbers. There are separate explanations (where appropriate) for the manual, semi-automatic, and fully-automatic machines (TK, NEA, and ESA-0 respectively). The same methods can also be used with the similar 1950s models NTK, NE, and ESA. The book has numerous cartoon illustrations, and 9 pages of conversion tables.


 

Facit Short-cut Calculations Cover Short-cut calculations with Facit (1958)
48 pages plus covers, colour, A5 size, stapled booklet.

This book is a later version of the "More ways to get the most..." manual (above). The examples, illustrations, and conversion tables are mostly the same, but the explanations have been updated where necessary to suit the newer C1-13, CS1-13, and CA1-13 machines.


 

Friden

Friden Model D Manual Cover Friden Automatic Calculators - Operating Instructions - General Utility Model "D" (1940-49)
16 pages including covers, 9" x 4", stapled booklet.

This small but quite comprehensive manual describes the operation of the Friden "General Utility" calculator Model D. This is a semi-automatic machine with manual add-and-shift multiplication and fully automatic division. The manual describes the operation and use of the controls (including the double division key), and gives step-by-step examples of many types of business calculations.


 

Friden STW Manual Cover Friden Automatic Calculators Models CW and DW - Operating Instructions and Suggestions (c.1950)
16 pages plus covers, A5 size (original 8-1/2 x 5-1/2"), stapled booklet.

This manual describes the controls and operation of the Friden semi-automatic calculators Models CW and DW with automatic division and manual add-bar multiplication. There are step-by-step examples of many types of business calculations. The instructions can also be used with the earlier Friden Models C and D "with very few exceptions - which are easily recognised".


 

Friden STW Manual Cover Friden Fully Automatic Calculator Model STW - Operating Instructions and Suggestions (1958)
80 pages plus covers, A5 size (original 8-1/2 x 5-1/2"), comb bound.

This is a very comprehensive (80-page) manual for the fully-automatic Friden Model STW calculator with the 10-key multiplier keypad. The manual describes and illustrates all of the controls and features of the machine, and explains how they are used in typical business calculations. More complex examples include date calculations, interest and amortization, invoicing, and half-cent adjustments.


 

Friden SBT Manual Cover Friden Model SBT Calculator - Operating Instructions (1959)
16 pages plus covers, A4 size (original 8-1/2 x 11"), comb bound.

This concise but well-illustrated manual describes the fully-automatic Friden Model SBT calculator with the the 10-key multiplier keypad and the back-transfer mechanism. There are worked examples from many types of business calculations. The manual itself is interesting in that it was typeset on an early tape-controlled word processor (Friden's own "Justowriter"), and uses computer terminology (such as "programs") to describe the setting-up of the machine for particular calculations.


 

Friden STW (1963) Manual Cover Friden Fully Automatic Calculator Model STW - Instruction Manual (1963)
24 pages plus colour covers, A4 size (original 8-1/2 x 11"), comb bound.

This 1963 version of the STW instruction manual gives a concise introduction to the machine through a series of worked examples. Each example includes a "program" of machine settings, a highlighted keyboard diagram, and a step-by-step operating procedure. Topics include grand totals, discounts, pro-rata, and the "Fives method" for square roots. The manual includes a fraction-to-decimal table and a page showing other Friden models, including the EC-130 electronic calculator.


 

Lagomarsino

Lagomarsino Totalia S4GT Cover Lagomarsino Totalia S4-GT - Operating Instructions (1969)
6 pages, A5 size, loose leaf (in German).

This little manual gives concise operating instructions for the Totalia S4-GT fully-automatic printing calculator. It describes the procedures for multiplication and division, constant storage, grand total, back-transfer, and percentage calculations, with brief examples.


 

MADAS

MADAS Catalogue Cover MADAS product catalogue (1961)
8 pages including covers, A5 size, stapled booklet.

This catalogue gives illustrations and brief descriptions of the nine basic machines in the MADAS product range for 1961, from hand-cranked to fully-automatic. It mentions the variants of each model, and includes a list of optional features that were available on special order. The catalogue has been re-formatted from a long single sheet into an 8-page booklet.


 

MADAS LS Manual Cover Directions for Operating the MADAS Models 16LS, 20LS, and 20LZS (1952)
8 pages including covers, A5 size, stapled booklet.

This manual covers the semi-automatic MADAS machines, Models 16LS, 20LS, and 20LZS. There is a 2-page illustration, a full description of all of the controls, and some basic instructions for addition, subtraction, manual multiplication, and automatic division. The manual has been re-formatted from a long single sheet into an 8-page booklet.


 

MADAS 20AV Manual Cover Directions for the Proper Use of the MADAS Fullautomatic Models 20AV and 20AZV (1942)
8 pages including covers, A5 size, stapled booklet.

This manual is similar to the one above, but covers the early fully-automatic Models 20AV and 20AZV. There is an illustrated description of all of the controls, and brief instructions for addition, subtraction, automatic multiplication and division, and back-transfer. The manual has been re-formatted from a long single sheet into an 8-page booklet.


 

MADAS BTG Manual Cover Directions for the Proper Use of the MADAS Triplex 20 BTG and 20 BTZG
20 pages including covers and fold-out, A5 size, stapled booklet.

This is a much more comprehensive manual for the late-model fully-automatic machines with the "Triplex" carriage (Models 20 BTG and 20 BTZG). The manual illustrates and describes all of the controls and functions of the machines. It includes detailed instructions for addition, subtraction, multiplication, and division, including back-transfer operations, decimal setting, handling of complements, and the use of the auxilliary "Triplex" register. The instructions are also applicable to the earlier Model ATG (except for the location of the negative multiplication control).


 

MADAS (Goodman) Manual Cover How to use your MADAS calculating machine
32 pages plus covers and illustrations, A4 size (originally 10"x8"), comb bound.

This is a third-party manual written by Richard Goodman MA, BSc, from the Brighton College of Technology. It was printed in loose-leaf format and assembled in sections by the dealer to suit the type of machine purchased. There is a common introduction (3 pages), then one of three alternative sections to describe the manual, semi-automatic, or fully-automatic machines (13 pages plus illustrations), followed by a common section giving examples of quite complex commercial, mathematical, and statistical calculations (16 pages).


 

Marchant

Marchant Silent Speed Manual Cover Operating Instructions for Marchant "Silent Speed" Calculators (1943)
40 pages plus covers, colour, A4 size (originally 6" x 9"), comb bound.

This manual covers all of the Marchant "Silent Speed" calculators to 1943. It applies to both the semi-automatic D-series models with the bar-type multiplier, and to the fully-automatic M-series machines with the single-row multiplier keyboard. The manual describes the controls and features of the machines, and explains how they are used in basic and commercial calculations. Emphasis is given to the correct use of carriage tabulation, the setting of decimals, and the proving of results. The manual contains many useful hints for efficient operation, and gives details of several key combinations which are not immediately obvious from the keyboard. The instructions and examples can also be used with the later Figuremaster and Figurematic machines, with only minor adjustments. This reproduction manual is printed at the original size (6" x 9") on A4 paper.


 

Marchant ADX Manual Cover Simple Instructions for Marchant Figurematic Calculator Model ADX (1953)
8 pages including covers, A5 size, stapled booklet.

This manual describes the operation of the Marchant fully-automatic calculator Model ADX. The manual describes all of the controls and features of the machine, and includes sections on automatic multiplication and division, setting of decimal points, and use of the carriage tabulator. This manual has been reduced by 8% from the 9"x6" original so that it can be printed on A4 paper.


 

Marchant DCR Manual Cover Operating Instructions for Marchant Semi-Automatic Calculator Model DCR (1960)
8 pages including covers, A5 size, stapled booklet.

This manual describes the operation of the Marchant semi-automatic (or D-series) calculator Model DCR from around 1960. The semi-automatic machines are essentially the same as the fully-automatic, except that they do not have the automatic multiplier. The manual includes sections on short-cut multiplication, using the carriage tabulator, and automatic division setup. This manual has been reduced by 8% from the 9"x6" original so that it can be printed on A4 paper.


 

Marchant SK Manual Cover Operating Instructions for Marchant "Deci-Magic" Model SK (1962)
32 pages plus covers, A4 size (originally 8.5" x 11"), comb bound.

This manual describes the operation of the Marchant "Deci-Magic" calculator with the front multiplier register, also known as the "single-keyboard automatic" or SKA. This 1962 edition shows the SCM Model SK in the tan-coloured casing, but it can also be used (with only minor adjustments) for the earlier Model SKA in the streamlined blue casing. The manual describes all of the keyboard controls, the basic operations, and techniques for automatic multiplication and division (including accumulations in the counter register). Worked examples include chain discounts, pro-rating, statistics, and square roots.


 

Millionaire

Millionaire Instructions Cover Millionaire Calculating Machine - operating instructions (c.1900)
24 pages plus covers, A5 size, stapled booklet.

This manual describes and illustrates the controls on the Millionaire calculating machines, and describes the procedures for addition, subtraction, multiplication, and division. Example calculations include proportions, interest, and square roots.


 

Monroe

Monroe MA-7 Manual Cover How to Operate Monroe Adding Calculator Model MA-7 (c.1940)
Single sheet, spot colour, 8-1/2" x 11", folded pocket card.

This little manual for the Monroe MA-7 semi-automatic calculator is in the form of a single letter-sized sheet folded into a 6-panel pocket reference card. It describes the location and operation of the controls, the methods for performing basic calculations, and the setting of decimal points.


 

Monroe LN Manual Cover Operating Instructions for Monroe Models LN-160 and LN-200 (1953)
20 pages, colour cover, A5 size, stapled booklet.

This manual covers the desktop versions of the hand-cranked L-series machines, models LN-xxx. There is an illustration and description of the controls, with instructions and practice problems for addition, subtraction, multiplication, and division. There are detailed instructions for setting the decimal points. Although written for the 1953 models, the manual is equally applicable to any of the hand-cranked Monroe machines from the 1920s to the 1970s.


 

Monroe LX Manual Cover Operating Instructions for Monroe Models L-160-X and L-200-X (1953)
20 pages, colour cover, A5 size, stapled booklet.

This manual covers the portable and "Executive" versions of the hand-cranked L-series machines, models LX-xxx, L-xxx-X, and LN-xxx-X. There is an illustration and description of the controls, with instructions and practice problems for addition, subtraction, multiplication, and division. There are detailed instructions for setting the decimal points. Although written for the 1953 models, the manual is equally applicable to any of the hand-cranked Monroe machines from the 1920s to the 1970s.
 

Monroe LA-9 Manual Cover Monroe Compact Electric Calculator Model LA-9 - Instructions (1960)
20 pages plus foldout, colour cover, 5"x7", stapled booklet.

This manual describes the controls and operation of the motor-driven "Compact Electric" L-series machines. While written specifically for the late-model LA-9 with the lever-operated carriage shift, the instructions can also be used (with minor adjustments) with any of the earlier LA machines with the rotary shift control. The manual has instructions and practice problems for addition, subtraction, normal and short-cut multiplication, automatic division, and setting of decimal points. Practical examples include invoicing, pro-rating, and payroll calculations.


 

Monroe CSA Manual Cover Operating Instructions for Monroe Automatic Calculator Model CSA (1954)
14 pages plus covers, A5 size, stapled booklet.

This manual describes the operation of the Monroe CSA-8 and CSA-10 fully-automatic calculators (with 8 and 10 columns respectively). There is a full description of all the controls (including the un-labelled buttons), with instructions and examples for addition, subtraction, multiplication, division, decimal points, and several types of business calculations. In this 1954 edition (reprinted 1964) Monroe applied the new computer terminology to mechanical calculating by describing the machine setup for each problem as a "program".


 

Monroe Square Root Manual Cover Monroe machine methods for the extraction of square root (1953)
12 pages plus covers, A5 size, stapled booklet.

This manual describes three mechanical methods for the extraction of square roots. While written specifically for the Monroe calculator, the same methods can be used on any similar machine.


 

Multo

Multo Instructions Cover Instructions in Multo calculation (1959)
8 pages including covers, A5 size, stapled booklet.

This manual describes the controls and operation of the early Multo pinwheel calculators (Models 3, 13, 103, and 113). It covers basic operations (ASMD), back-transfer, short-cut and chain multiplication, and setting of decimal points. The manual has been re-formatted from a long single sheet into an 8-page booklet.


 

Multo (Odhner) Instructions Cover Multo Instructions (1966-70)
12 pages plus covers, spot colour, A5 size, stapled booklet.

This manual covers the late-model Multo pinwheel calculator. The original Multo calculators (above) were discontinued in 1966 (when Addo was absorbed into the Facit/Odhner organisation), and were replaced with a re-badged Original-Odhner Model 239. The manual is essentially the same as the Odhner instruction manual "Let Original-Odhner do the work for you" (below), with minor changes in terminology and in a larger A5 format. It covers basic operations (ASMD), back-transfer, short-cut and chain multiplication, additive and subtractive division, and calculation of square roots.


 

Original-Odhner

Odhner Instructions c.1950 Cover Multiply and divide on an Original-Odhner (c.1950)
32 pages plus covers, spot colour, 118x210mm, stapled booklet.

This well-illustrated manual from about 1950 describes the features and operation of the Original-Odhner range of pinwheel calculators. The illustrations show the new 100-series Models 127 and 129, together with the previous Models 24, 37, and 39. The instructions cover the proper set-up and operation of the machine, basic arithmetic (ASMD), and practical calculations. The emphasis is on multiplication and division, with examples including proportions, discounts, percentages, and square roots. There are several half-page illustrations showing the machines in use, an internal view, and a (politically incorrect) map of Odhner agencies around the world.


Odhner Instructions c.1955 Cover Let Original-Odhner do the work for you (c.1955)
20 pages including covers, spot colour, 127x127mm, stapled booklet.

This little manual gives a concise description of the features and operation of the Original-Odhner pinwheel calculator, with examples covering basic arithmetic (ASMD), proportions, discounts, percentages, and square roots. The illustrations show the mid-1950s Model 227, but the manual is equally applicable to any of the 200-series models (and in principle to any of the earlier models). The young lady on the cover is said to be Sweden's Miss World winner from 1952.


Odhner 239 Cover Original-Odhner Calculator Model 239 - Operating Instructions (c.1955)
49 pages plus covers, A4 size (originally 10" x 8"), comb bound.

This is a third-party manual prepared by the Educational Division of Block & Anderson in London. (B&A were a major firm of office equipment suppliers who handled many types of calculating machines). The manual was most probably used in their in-house training courses for operators of the Odhner 239 machines. The manual gives detailed instructions for basic arithmetic (ASMD), short-cut multiplication, chain calculations, squares and square roots, setting of decimal points, and calculating in Sterling currency. Each section has worked examples and test questions (with answers). The focus is on the detail of operating the machine rather than on its application to business calculations.


Odhner 1048/49 Cover Operating Instructions - Odhner 1048/1049 (Nov. 1970)
8 pages including colour covers, 210x210mm, comb bound.

This 1970 manual describes the features and operation of the late-model pinwheel calculators Models 1048 and 1049. Model 1049 is essentially the same as the Model 239, while the 1048 is the same again but without the setting check dial. The instructions cover the basic operations (ASMD), discounts and percentages, short-cut multiplication, and the setting of decimal points. The manual has been re-formatted from a long single sheet into an 8-page booklet.


Odhner Rex Cover Practical Calculations (Rex) for the Original-Odhner Calculator (c.1950)
48 pages plus covers, A5 size, stapled booklet.

This book is intended "for the Odhner operator (and especially the Odhner salesman) who wants to know calculations more advanced than those of the elementary kind..." It describes several interesting computational techniques, including the use of complements and "negative division" in chain calculations. There are worked examples of about 50 different types of commercial and business calculations. While the book is written specifically for the Odhner 100-series machines, the methods described can be used on any similar pinwheel calculator. (The term "Rex" appears to come from the German word for calculation, although it does not have this meaning in English).


Odhner Tables Original-Odhner Table of Decimal Equivalents (c.1950)
11 pages plus covers, A5 size (landscape), comb bound.

Books or charts of conversion tables were widely used to assist in calculations in non-decimal systems. This compact booklet contains ten of the most useful tables of decimal equivalents for common fractions, English currency, interest rates, English weights (pounds, quarters, hundredweight, and tons), dozens and gross, hours and minutes, feet and inches, and timber in board (or super) feet. This booklet was originally distributed to Original-Odhner customers, but the tables can be used with any calculating machine.


Odhner XX11C Cover Instruction Book - Odhner XX11C (1965)
16 pages including covers, spot colour, 127x127mm, stapled booklet.

This 1965 booklet describes the controls and operation of the Odhner XX11C electric adding machine with the credit balance and short-cut multiplier mechanisms. Example calculations include pricing, discounts, and accumulative multiplication.


Otis King

Otis King Manual Cover Otis King's Calculator - Operating Instructions
8 pages including covers, 8" x 5", stapled booklet.

This booklet describes the construction and operation of the Otis King cylindrical slide rules, Models K and L. Examples include multiplication and division, proportions, percentages, Sterling currency, powers and roots, and methods for locating the decimal point in complex calculations. The manual has been re-formatted from a long single sheet into an 8-page booklet.


 

PLUS

PLUS Manual Cover PLUS Rapid Adder - Operating Instructions
12 pages plus covers, A5 size, stapled booklet.

This little manual was prepared for use in the PLUS training courses in Australia. It covers basic addition and multiplication in both Sterling and decimal systems, with practice examples and currency conversion tables.


 

Sanyo

Sanyo ICC-82D Manual Cover Sanyo ICC-82D - Instruction Manual (1970)
18 pages plus covers, spot colour, 175x125mm, stapled booklet.

This is the manual for Sanyo's classic ICC-82D portable battery-powered calculator from 1970. The book gives very detailed explanations, on the (quite reasonable) assumption that the reader has never seen an electronic calculator before. In addition to covering the basic operations, it explains all of the early peculiarities which are not immediately obvious, including double-precision operation, chain calculations, and the display of complements for negative numbers.


 

Sanyo ICC-1123 Manual Cover Sanyo ICC-1123 - Instruction Manual (1973)
40 pages plus colour covers, 180x130mm, stapled booklet.

This manual describes the features and operation of Sanyo's ICC-1123 calculator from 1973. It is also suitable for the earlier ICC-1122, which operates in exactly the same manner. The manual covers basic and advanced operations, including square roots by Newton's method, and gives examples of many types of practical business calculations.


 

Schubert

Schubert DRV Manual Cover Schubert Pinwheel Calculator - Operating Instructions
32 pages plus covers, fold-out, A5 size, comb bound.

This manual describes the Schubert models DRV, CRV, DW, and CW. It covers all the basic operations and gives examples of more complex business calculations. There are 4 pages of tables, including a table for calculating by grosses. (Note: the original English-language manual was printed in loose-leaf sections that could be assembled to suit different models. Several pages mentioned in the index of this manual are not actually present in the book. I have checked my copy of the manual against two others from overseas, and all three have the same index and exactly the same combination of pages).


 

Sharp

Sharp PC-1001 Manual Cover Sharp Compet PC-1001 - Instruction Manual (1973)
52 pages plus covers, fold-out, colour, 155x125mm (approx), comb bound.

This manual describes the operation and programming of the Sharp PC-1001 desktop scientific calculator from 1973. The PC-1001 is an unusual calculator, in that the circuitry is based on a general-purpose commercial microprocessor system (the Rockwell PPS-4) rather than a dedicated calculator chipset. The instruction manual gives descriptions and examples of basic and scientific funtions, memory usage, and keystroke programming, and includes a detailed Table of Accuracies.


 

Sumlock

Sumlock Duolectric Service Manual Cover Sumlock Electric and Duolectric Adding-Calculators - Service Manual
103 pages plus covers, A4 size (originally 10" x 8"), comb bound.

This comprehensive service manual describes the motor-driven Sumlock calculators, both single and dual register, and applies also to the identical machines sold under the Comptometer brand. The first section (30 pages) describes the construction and theory of operation of the machines. The main section (60 pages) gives detailed procedures for removal, replacement, and adjustment of all of the components and assemblies. The final section describes service tools and common problems. The manual is well illustrated with line drawings, annotated photographs, and part names and numbers. The 10" x 8" original has been reprinted on A4 paper. Several multi-page fold-outs have been re-formatted into the body of the text, leaving occasional blank or un-numbered pages.


 

Victor

Tallymaster Mark V Instructions Operating Instructions for Tallymaster Mark V Electric Home Adding Machine.
12 pages including covers, spot colour, 8.5" x 5.5" (landscape), comb bound.

This little manual describes the controls of the Tallymaster "Home Adding Machine", and gives basic instructions and examples for addition and subtraction. It includes warranty and service information, and a brief questionaire for the new "home" users.


  Victor 6 & 7 series Service Manual Service Manual for Victor Portable Subtractors (6 and 7 series, hand operated, January 1949).
58 pages including covers, A4 (originally 8.5x11), comb bound.

This service manual gives a very detailed and well-illustrated explanation of the mechanism and internal operation of the Victor 6 and 7 series (or 600/700 series) hand operated adding machines. The same basic mechanism was used in all of the Mehan Victors, including those with optional features such as direct subtraction, true negative totals, and electric motor drive.


 

Victor mechanism drawing Victor Technical Documentation.

A number of original Victor service manuals, parts manuals, mechanism descriptions, and technical documents have been donated from the estate of a former Victor calculator technician. The manuals cover various models from the 5, 6, and 7 series, up to the automatic Premier machines from the 1960s. Restorers with a specific interest in any of these Victor machines can request further details via the Enquiry Form.


 

Walther

Walther WSR160 Sales Info Cover Walther WSR160 Pinwheel Calculator - Sales Information
6 pages, A4 size, loose leaf.

This is not an end-user manual, but rather a set of instructions supplied to the Walther salesmen to assist them in presenting and demonstrating the features of the machine. It covers all the controls and operations of the WSR160, including back-transfer, negative balances, short-cut multiplication, and extraction of square roots.


 

Walther WSR160 Service Manual Cover Walther WSR160 Pinwheel Calculator - Service Manual
24 pages plus covers, A4 size, comb bound.

This factory service manual for the Walther WSR 110 and 160 pinwheel calculators contains detailed step-by-step instructions for disassembling, reassembling, lubricating, and adjusting the machines. There are 17 main illustrations showing all of the parts and operations involved (with part numbers), and a detailed cross-sectional drawing.


 

Walther mechanism drawing Walther Technical Documentation.

A number of original Walther service manuals, parts manuals, mechanism descriptions, and technical documents have been donated from the estate of a former Walther calculator technician. The manuals cover most of Walther's post-war mechanical calculators and adding machines, and the first of the early-70s electronic calculators. Restorers with a specific interest in any of these Walther machines can request further details via the Enquiry Form.


 
Original text and images Copyright © John Wolff 2009-15.
Please use the Enquiry Form for further information on any of these items.
Last Updated: 14 July 2015.
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