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Adding machine

An adding machine is a mechanical or electromechanical device designed to automate arithmetic calculations, primarily addition and subtraction, through the use of gears, levers, dials, and cranks, serving as a precursor to modern calculators.^[1]^[2] The origins of adding machines trace back to the early 17th century, with the first known mechanical calculating device attributed to German astronomer Wilhelm Schickard, who constructed the "calculating clock" in 1623 for basic addition and subtraction.^[3] In 1642, French inventor Blaise Pascal developed the Pascaline, an eight-digit gear-based machine capable of addition and subtraction with automatic carry-over, of which approximately 50 units were produced for use in tax calculations.^[1]^[4] Subsequent advancements expanded functionality; in the 1670s, Gottfried Wilhelm Leibniz created the "stepped reckoner," incorporating a stepped drum mechanism to enable multiplication, division, and square roots alongside addition.^[1]^[3] The first commercially successful model, the Arithmometer, was patented by Charles Xavier Thomas de Colmar in 1820 and mass-produced from the 1850s, relying on Leibniz's design for four arithmetic operations and becoming widely used in European offices.^[1]^[3] By the late 19th century, innovations like Willgodt Odhner's 1875 pinwheel mechanism allowed for more compact and efficient designs, such as the Brunsviga model introduced in 1892, which facilitated mass production and broader adoption in business settings.^[1] In the United States, William S. Burroughs patented an adding and listing machine in 1885, which printed results on paper rolls and dominated office use from the 1890s through the mid-20th century for accounting and inventory tasks.^[4] Adding machines proliferated during the Industrial Revolution, particularly from 1880 to 1950, as essential office equipment for merchants, governments, and businesses handling large volumes of numerical data, often powered manually via cranks or electrically after the 1920s.^[4]^[2] Their decline began in the 1970s with the advent of inexpensive electronic calculators using microchips, which offered greater speed, portability, and versatility, ultimately rendering mechanical adding machines obsolete.^[2]^[4]

History

Early Concepts and Inventions

The evolution of adding machines began with ancient manual aids like the abacus, which used beads or pebbles on rods or grooves to perform addition and subtraction through positional manipulation, laying the groundwork for structured arithmetic tools.^[5] In 1623, German astronomer and mathematician Wilhelm Schickard constructed the first known mechanical calculating device, called the "calculating clock," designed to assist with astronomical calculations for his friend Johannes Kepler. It featured gear-based mechanisms for addition, subtraction, and basic multiplication via repeated addition, along with a bell to signal carry-over, but prototypes were lost to fire and never mass-produced.^[6] In the early 17th century, Scottish mathematician John Napier advanced this progression with his invention of "Napier's bones" in 1617, a set of numbered rods made from ivory or wood that facilitated multiplication and division by aligning digits to generate partial products, effectively digitizing multiplication tables for manual use and inspiring later mechanical automation of arithmetic.^[7] These devices represented a conceptual shift from purely manual counting to semi-automated aids, emphasizing the need for mechanical intervention to reduce human error in repetitive calculations.^[5] A pivotal step toward fully mechanical adding occurred in 1642 when French mathematician Blaise Pascal, at age 19, invented the Pascaline to assist his father, a tax collector, with laborious arithmetic for Rouen tax audits.^[8] The device employed a series of crown gears connected to numbered dials, allowing users to input numbers by turning wheels clockwise; addition was achieved as gears advanced corresponding digit wheels, displaying results in small windows, while subtraction used nines' complements to reverse gear direction.^[8] However, the Pascaline had significant limitations, including manual carry-over managed by weighted ratchets that frequently jammed, restricting it to 5- to 8-digit additions and requiring repeated operations for multiplication or division, which prevented widespread adoption despite Pascal producing about 50 units and securing a 1649 royal patent.^[8] Building on Pascal's gear principles, German philosopher and mathematician Gottfried Wilhelm Leibniz developed the Stepped Reckoner around 1673 to perform all four arithmetic operations automatically, aiming to enhance scientific computation beyond manual aids.^[9] Its core mechanism featured stepped drums—cylindrical wheels with teeth of graduated lengths (from 1/10 to 9/10 of the circumference)—mounted on a central shaft; for addition, users set digits via sliders engaging the appropriate teeth, then cranked a handle to accumulate results, while multiplication and division used repeated engagements and a movable carriage for multi-digit handling.^[9] Despite its innovative design, the machine proved unreliable due to imprecise 17th-century manufacturing tolerances, causing the carry mechanism to fail during multi-digit operations and requiring manual adjustments, resulting in only prototypes that were never mass-produced.^[9] In the 18th century, efforts continued with rudimentary prototypes that refined addition capabilities but struggled with practicality. Italian physicist Giovanni Poleni constructed the first known automatically multiplying calculator in 1709, using a wooden pinwheel mechanism with adjustable pins (0-9 teeth) driven by clockwork weights to perform addition via direct wheel engagements and multiplication through iterative additions.^[10] This device supported three-digit operations but lacked durability and scalability, leading Poleni to dismantle it upon learning of superior designs. These attempts highlighted the persistent challenges in precision engineering, paving the way for more robust 19th-century implementations without yielding commercially viable machines.^[5]

19th-Century Commercialization

The commercialization of adding machines gained momentum in the 19th century as the Industrial Revolution expanded industrial production, trade, and financial services, creating a pressing need for faster and more accurate accounting tools to handle increasing volumes of transactions. Businesses, banks, and governments sought devices to reduce human error in arithmetic calculations, which previously relied on manual methods like pen-and-ink ledgers. This economic context spurred inventors to refine prototypes into marketable products, leading to the establishment of dedicated manufacturing firms and the issuance of numerous patents.^[11] A pivotal invention was the Arithmometer, developed by French inventor Charles Xavier Thomas de Colmar and patented in 1820. This machine utilized the Leibniz wheel—or stepped drum—mechanism, consisting of cylindrical gears with helical teeth that enabled reliable addition and subtraction by engaging varying numbers of cogs via a crank. Unlike earlier experimental devices, the Arithmometer was the first calculator to achieve commercial success, with de Colmar founding a production company in Paris around 1851 to manufacture it for sale to European offices and institutions. Over its lifespan, approximately 1,000 units were produced by 1870, demonstrating its viability in practical use for tasks like insurance computations and statistical tabulations.^[12]^[13]^[14] In the United States, patent activity for adding machines surged in the mid-19th century, reflecting growing domestic demand amid rapid industrialization. One early example was Du Bois D. Parmelee's 1850 patent for a key-driven adding device, which allowed users to enter digits directly via push-keys of graduated heights that incremented numbered wheels, bypassing the crank mechanism found in European designs. Although not mass-produced, such innovations laid groundwork for later commercial models by emphasizing user-friendly input methods. By the 1870s, inventors like William Seward Burroughs began integrating printing features into crank-operated machines, producing receipts of entered digits and totals to support auditing—a feature patented in 1888 that enhanced adoption in accounting offices. These developments coincided with the formation of manufacturing firms, such as the American Arithmometer Company in St. Louis in 1886, which scaled production to meet business needs.^[15]^[16] The Comptometer, patented by American inventor Dorr E. Felt in 1887, represented a breakthrough in commercial viability. This key-driven calculator dispensed with cranks entirely, using a columnar layout of digit keys (arranged in rows for place values like units, tens, and hundreds) to enable rapid, direct addition of multi-digit numbers without sequential entry. Felt's design allowed operators—often trained "comptometerists"—to process columnar data at speeds up to 100 entries per minute, making it ideal for bookkeeping. In 1889, Felt partnered with Robert Tarrant to establish the Felt & Tarrant Manufacturing Company in Chicago, which began mass production and sold thousands of units by the 1890s, primarily to U.S. businesses expanding during the Gilded Age. The Comptometer's success underscored how specialized adding machines became essential tools for modern commerce, outselling competitors through demonstrations at trade fairs and offices.^[17]^[18]

Mechanical Design and Operation

Core Mechanisms

The core mechanisms of adding machines relied on intricate gear systems to perform arithmetic operations mechanically. The Leibniz wheel, also known as the stepped drum, was a foundational component in early designs, consisting of a cylindrical gear with teeth of progressively increasing length arranged in a spiral pattern. When a digit was set via an input lever, it positioned the drum to engage a corresponding number of teeth with a counting wheel; rotating the operating crank then advanced the counting wheel by that amount, adding the value to the register. For multi-digit addition, carry-over occurred automatically: if the counting wheel exceeded nine teeth, a protruding tooth on the drum actuated a lever that incremented the adjacent higher-order drum by one, propagating the tens carry through the mechanism as needed.^[12] In later models, the pinwheel mechanism supplanted the Leibniz wheel for greater compactness and reliability, featuring a disc with radial slots containing retractable pins that could be extended to represent digits from zero to nine. Setting a digit extended the appropriate number of pins, which then meshed with a counter gear during crank rotation to add the value; the pins' radial arrangement ensured proportional advancement based on their count. Carry-over and tens propagation functioned similarly, with excess rotation triggering a transfer pin or lever to advance the next column's pinwheel, allowing seamless handling of multi-digit sums without manual intervention.^[19]^[20] Escapement and clutch mechanisms were essential for precise control, preventing over-rotation and enforcing sequential operations. The escapement, often a pawl or click device on the counter wheels, locked the gear after each digit increment, allowing only unidirectional advancement during the forward crank stroke while blocking reverse motion to avoid erroneous subtractions. The clutch, typically a friction or dog-type engager linked to the drive shaft, connected the power source (manual crank or motor) to the gear train for one complete cycle per operation, disengaging on the return stroke to reset without altering the register and ensuring operations proceeded column by column.^[20]^[21] Subtraction was achieved through the 9's complement method, converting the operation to addition by entering the complement of the subtrahend (each digit subtracted from 9) and adding it to the minuend; any end carry was discarded and 1 added to the result, yielding the difference, while borrow propagation was handled inherently by the gear carry-over in reverse. For example, to subtract 123 from 500, the operator entered 876 (9's complement of 123) and added it to 500, resulting in 1376, from which the leading 1 (carry) was discarded and 1 added to 376 to give 377. This approach leveraged the machine's addition hardware without requiring separate subtraction gears.^[22]^[23] Basic multiplication and division extended the addition principle through repetition. Multiplication involved repeated additions of the multiplicand, shifted by carriage position for each power of ten: for 23 × 12, the operator added 23 twice in the units column (for the 2), then shifted the carriage one position to the left and added 23 once (for the 1 in the tens place). Division used repeated subtractions of the divisor from the dividend until underflow, counting the quotients via a revolution register and shifting the carriage downward for decimal places; for instance, dividing 100 by 4 required subtracting 4 twenty-five times across units and tens. These processes demanded user oversight for shifts but minimized mechanical complexity.^[24] Material innovations enhanced durability and accuracy, with hardened steel gears resisting wear from repeated engagements and spring-loaded levers providing consistent tension for reliable pin retraction and carry actuation. These steels, often case-hardened for surface toughness while maintaining core ductility, allowed high-volume operations without deformation, while phosphor bronze or tempered steel springs ensured smooth escapement release and clutch engagement under varying loads.^[25]

Input and Output Methods

Early adding machines primarily utilized rotary dials or lever arms for data entry, allowing users to set digits by turning or positioning mechanical components before initiating computation. For instance, Blaise Pascal's Pascaline (1642) employed rotary dials to input numbers, while Charles Xavier Thomas de Colmar's Arithmometer (1820) used sliding levers to engage specific digit values on rotating wheels, enabling manual selection for addition and subtraction.^[5]^[26] By the late 19th century, input methods evolved toward full keyboards to enhance speed and usability, culminating in Dorr E. Felt's Comptometer (1887), which featured columnar arrays of nine keys (numbered 1 through 9) for each digit position, eliminating the need for sequential digit setting. The full-keyboard approach evolved, with the 10-key layout (including 0) standardized around 1900 in subsequent designs such as the Standard Adding Machine, permitting trained operators to enter numbers at rates exceeding 200 additions per minute, a marked improvement over lever-based systems that limited throughput to manual adjustments.^[17]^[27]^[28] Output mechanisms in adding machines balanced immediate visibility with permanent records, often combining mechanical displays with printing capabilities. Numbered wheels or drums, visible through apertures on the machine's front panel, served as analog displays to show running totals directly, relying on gear linkages for real-time updates. In contrast, printed tapes provided auditable outputs using inked ribbons to transfer impressions from rotating typewheels onto paper rolls, recording each entry and subtotal for verification; Burroughs models from the 1880s onward printed narrow single-column tapes, evolving to multi-column formats by the early 1900s to support complex ledgers.^[29]^[30] Error-handling features were integral to reliable operation, including zeroing cranks that rotated registers back to zero via a side-mounted handle, clearing accumulators after computations or to start fresh entries. Reversible operations, toggled by add/subtract levers, allowed corrections by entering negative values to offset mistakes, while the printed tape ensured verifiable totals by documenting sequential entries in ink, enabling post-calculation audits without relying on memory or visual displays alone.^[31]^[32] Ergonomic considerations emphasized office efficiency, with most adding machines designed as heavy, desk-mounted units featuring angled keyboards and stable bases to minimize fatigue during prolonged use. Portable variants, such as the Burroughs Portable Adding Machine introduced in the 1920s, incorporated compact frames and hand cranks for mobility in non-office settings. Carriage shifts, operated by front levers or knobs, facilitated multi-column entries by laterally moving the paper tape or register alignment, streamlining tabular accounting without manual repositioning.^[27]^[33]

Notable Models and Manufacturers

Burroughs Adding Machine

William Seward Burroughs, born on January 28, 1857, in Rochester, New York, began his career as a bank clerk in the late 1870s, where the tedium of manual arithmetic calculations inspired him to develop a mechanical aid for accounting tasks.^[34] After moving to St. Louis, Missouri, in the early 1880s to work at the Boyer Machine Shop, Burroughs experimented with prototypes starting in 1882, culminating in his first patent for a "calculating machine" (U.S. Patent No. 388,116) granted on August 21, 1888.^[35] This invention, often referred to as the arithmometer or registering adding machine, featured a full-keyboard design for direct numerical entry and a novel oil-filled dashpot mechanism that regulated the operating handle's pull to ensure smooth, error-resistant operation even under varying user pressure.^[36] An improved version followed with U.S. Patent No. 497,416 in 1893, addressing initial accuracy issues in the printing mechanism.^[34] The 1888 arithmometer supported up to 11 digits for calculations and totals, with entries made via a full keyboard of 1-9 keys per column (zeros implied), enabling rapid addition without a separate crank for computation—instead, a single handle advanced the paper and registered entries.^[37] It printed results on a continuous roll of sprocketed paper tape for permanent records, a key feature for auditing in financial settings, and operated silently compared to clacking competitors.^[38] Later mechanical models in the early 20th century retained this core but introduced a half-keyboard or 10-key variant for faster single-column entry in high-volume tasks, while electric versions from the 1920s onward incorporated solenoids to automate key depression and paper feed, eliminating manual handle pulls entirely.^[37] These adaptations made the machine particularly suited for banking environments, where it automated ledger balancing and transaction totaling with minimal training.^[35] In 1886, Burroughs co-founded the American Arithmometer Company in St. Louis with investors to manufacture his device, producing about 50 units initially by 1887.^[35] Following Burroughs's death from tuberculosis on September 14, 1898, at age 41, the company reorganized and was renamed the Burroughs Adding Machine Company in 1905 to honor its inventor.^[27] Production ramped up rapidly, with annual sales reaching 7,804 machines in 1905 and over 13,300 in 1907; by 1910, more than 100,000 units were in use worldwide, predominantly in banking and commercial offices.^[27] The company adapted models for specialized banking needs, such as integrating with ledger trays for sequential transaction posting, which streamlined daily reconciliations.^[39] A standout innovation was the Burroughs Manifold system, introduced in the early 1900s, which allowed simultaneous printing on multi-part carbon-copy forms for generating duplicate receipts and journals in one operation, reducing clerical errors and paper handling.^[27] This feature, combined with the machine's reliable printing and error-proofing, played a pivotal role in standardizing office accounting practices by enforcing auditable records and accelerating routine computations, transforming bookkeeping from a labor-intensive art into a mechanized process.^[40]

Competitors and Variants

The Comptometer, developed by Dorr E. Felt and manufactured by the Felt & Tarrant Manufacturing Company from the late 1880s through the 1940s, represented a key competitor to printing adding machines through its non-printing, full-keyboard design with one key per digit. This key-driven mechanism allowed for rapid direct entry of multi-digit numbers without shifting, enabling skilled operators to perform auditing and accounting tasks at speeds up to 100 entries per minute. Felt & Tarrant faced legal challenges from the Burroughs Adding Machine Company, including a 1900s patent infringement suit over tabulating features and a 1920s case alleging design imitation, which forced Burroughs to alter its machine's appearance.^[17]^[41]^[42] The Monroe Calculating Machine Company, founded in 1912, introduced models in the 1910s that expanded beyond basic addition into more versatile calculating functions, competing with specialized adding devices. Early models like the Model K (introduced around 1921) featured a stepped-drum mechanism for addition, subtraction, multiplication, and manual division using quotient counters to track results iteratively. By the mid-1920s, the company pioneered motorized versions, such as the Model KA (1922), which incorporated an AC induction motor for automated operation, reducing manual effort and increasing efficiency in office environments.^[43]^[44] European manufacturers produced influential variants of adding and calculating machines in the 1890s, often leveraging pinwheel mechanisms for broader arithmetic operations and achieving significant export success. The Brunsviga, developed by Grimme, Natalis & Co. in Germany starting in 1892, utilized cylindrical pinwheels for addition, subtraction, multiplication, and division, with early models featuring lever-set dials for input and becoming a staple in engineering and commercial settings across Europe and beyond. Similarly, the Odhner arithmometer, invented by Swedish engineer Willgodt Theophil Odhner and commercially produced from 1890 in Sweden, employed lever-set dials to adjust pins on an 8-wheel pinwheel system, supporting up to 10-digit results; its design was licensed internationally, with exports to the United States via agents like The Spectator Company by 1897, influencing global calculator development.^[45]^[33] Specialized adding machines emerged for inventory tracking and retail, adapting core adding functions to printing and registration needs. Listing machines, such as the Dalton (introduced 1909) and Wales (1905), printed itemized totals on paper rolls for inventory audits in stores and factories, priced between $125 and $175 to serve mid-sized businesses. Cash registers with integrated adding capabilities, like those from the National Cash Register (NCR) Company, dominated the market with models that accumulated sales totals and issued receipts; by the 1930s, NCR held approximately 90% of the cash register market share in the early 1900s, though competitors like Sweda and Victor eroded this dominance amid economic shifts.^[27]^[46]

Cultural and Technological Impact

Role in Business and Accounting

The introduction of adding machines in the late 19th century revolutionized bookkeeping practices by automating arithmetic calculations, which previously relied on manual methods prone to human error. These devices significantly reduced computational inaccuracies, with early models like the Comptometer achieving up to 99.4% accuracy in tasks such as trial balances and ledger postings.^[11] In industries like railroads, the New York Central Railroad adopted tabulating machines in 1897 to process over 4 million waybills annually, streamlining freight accounting and payroll for thousands of employees while minimizing discrepancies in billing and wage computations.^[11] Similarly, large-scale operations such as Warner Sugar Refining in the 1910s employed just three operators with adding machines to handle 1,000 accounts daily, demonstrating efficiency gains in inventory and financial tracking that were unattainable manually.^[11] Adding machines facilitated the standardization of accounting procedures, particularly in maintaining double-entry ledgers, by producing printed totals that ensured verifiable balances across debits and credits. The loose-leaf ledger system, popularized in the early 20th century, complemented these machines by allowing simultaneous totaling of multiple accounts, which accelerated reconciliation and reduced the risk of imbalances in complex financial records.^[11] This integration promoted uniform practices, as seen in the Retail Dry Goods Merchants Association's adoption of standardized formats by 1930, enabling consistent reporting across retail and commercial sectors.^[11] The emergence of specialized roles, such as "adding machine operators," became a distinct occupation, with training programs emphasizing machine-specific skills to support these procedural advancements. Economically, adding machines offered substantial cost savings for businesses, priced at $300 to $500 per unit in the early 1900s, far less than the annual salary of clerical workers, which averaged around $580 for general male laborers and $321 for female laborers (though skilled bookkeepers earned higher, often $800–$1,200).^[27]^[47] One firm, Gulf Pipe Line, reduced its accounting staff from 39 to 35 in 1914 using Burroughs machines, saving $500 monthly in labor costs while maintaining output.^[11] For large banking enterprises in the 1920s, these machines helped scale operations and support expanded financial transactions without proportional staff increases.^[48] Socially, the proliferation of adding machines reshaped office dynamics, particularly by increasing women's entry into clerical roles as machine operators in the 1910s. By 1910, women comprised nearly 41% of bookkeepers, rising to a majority by 1930, as employers favored their lower wages and perceived dexterity with mechanical devices over male clerks.^[49]^[32] This shift feminized bookkeeping, creating pathways for female employment in commerce and finance while reinforcing gender segregation, with women handling routine operations and men dominating higher-level accounting positions.^[50] Adding machines were also adopted by government agencies, such as the U.S. Treasury Department in the early 1900s for tax and fiscal accounting, enhancing efficiency in public sector record-keeping.^[4]

Transition to Modern Calculators

The transition from mechanical adding machines to electronic calculators began in the 1930s and 1940s with the introduction of electromechanical models that incorporated electric motors to drive traditional mechanical components, reducing manual effort while retaining core mechanical operations.^[37] Burroughs Adding Machine Company, a leading manufacturer, pioneered such innovations as early as the 1920s and expanded them in the 1930s with motor-driven portables and listing machines, which automated carriage shifts and printing for faster office use.^[51] These devices bridged the gap to full electronics by integrating electrical power, but they still suffered from mechanical wear, noise, and limitations in speed compared to emerging vacuum tube technology.^[52] A pivotal shift occurred in 1961 with the launch of the ANITA Mk VII and Mk VIII by the British firm Sumlock Comptometer Ltd., recognized as the world's first all-electronic desktop calculators. These machines used cold-cathode vacuum tubes for logic circuits and Nixie tubes for display, enabling silent, wear-free operation and calculations up to 12 digits without moving parts, marking a departure from mechanical designs.^[52] By the mid-1960s, transistors began replacing vacuum tubes in models like the Friden EC-130 (1963), offering greater reliability, lower power consumption, and compact size that further accelerated the obsolescence of mechanical systems.^[52] Several factors drove the decline of mechanical adding machines post-World War II, including rapid advancements in electronics spurred by wartime needs for ballistics computation and code-breaking, which popularized vacuum tubes and early transistors.^[52] Production efficiencies and integrated circuits drastically reduced costs, with desktop electronic calculators dropping from around $700 in the early 1960s to under $100 by the late 1970s, making them accessible beyond specialized offices.^[53] The introduction of portable handheld devices, such as the Hewlett-Packard HP-35 in 1972—the first scientific pocket calculator—further hastened the transition by providing on-the-go functionality at an initial price of $395, soon followed by even cheaper models.^[54] Today, mechanical adding machines hold significant collectible value due to their historical role in computation, with well-preserved units featured in museums like the National Museum of American History and restored for educational demonstrations of pre-electronic arithmetic.^[2] Enthusiasts and institutions value these artifacts for their intricate engineering, often restoring them to operational condition to illustrate the evolution toward modern digital tools.^[55]

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Wage-earning men averaged $11.16/ week in 1905. Source: U.S. Census of Manufactures, 1905. Manager's and clerk's pay by industry, 1907 and 1909. Source: ...Missing: accounting | Show results with:accounting
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History | JPMorganChase
... The hand cranked adding machine of the 1890s did the work of two people. The direct dial phone eliminated the need for a switchboard, while the electric ...
[45]
Women and the Paradox of Economic Inequality in the Twentieth ...
In 1910, 38 percent of bookkeepers, 85 percent of stenographers and typists, and 18 percent of clerks were women. Women became a majority of bookkeepers between ...Missing: dynamics | Show results with:dynamics
[46]
The Changing Genderization of Bookkeeping in the United States ...
From 1870-1930, bookkeeping became predominantly female, while accounting remained male-dominated, due to the separation of the two fields.<|separator|>
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The Burroughs Adding Machine Company - John Wolff's Web Museum
May 1, 2023 · The Burroughs Class 3 machine is based on the mechanism designed by William H Pike Jr for his Pike Adding Machine Company. Pike appears to ...Missing: clutch | Show results with:clutch
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Electronic Calculators: Desktop to Pocket
Jan 9, 2015 · Prior to 1960 there were three general types of calculating devices: mechanical adding machines, calculators (both mechanical and ...
[49]
Electronic Calculators—Handheld | Smithsonian Institution
Moreover, membranes replaced individual keys on some instruments. With all of these changes, cost of the devices plummeted. By 1977, a liquid crystal display ...
[50]
Electronic Calculators—Handheld
Over the course of the 1970s, handheld electronic calculators transformed the way tens of millions of people did arithmetic.
[51]
http://www.johnwolff.id.au/calculators/Burroughs/Burroughs.htm