Hugo Cook

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Hugo Cook The Indiana born engineer and instrument maker Hugo Cook (1856-1944) was a holder of many US patents from 1883 until 1925 for various devices (like sewing machine implements, bicycle spokes, autographic register, etc.), between them quite a few calculating machines. His first patent for adding machine (US430001) was granted in 1890. In 1891 […]

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Samuel Comfort

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History of Computers and Computing, Calculating tools, Gadgets, Samuel Comfort Samuel Comfort Samuel Comfort (1837-1923) of Morrisville, Pennsylvania, (see biography of Samuel Comfort) attained considerable distinction as an inventor of improvements in mowing and reaping machines, sewing machines, etc., for which he received numerous patents (by age 24 Comfort held over 12 patents in the […]

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Cathrinus Nikolay Arbo Collett

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History of Computers and Computing, Calculating tools, Gadgets, Cathrinus Nikolay Arbo Collett Cathrinus Nikolay Arbo Collett In late 1860s, Cathrinus Nikolay Arbo Collett (see biography of Cathrinus Collett), a young Norwegian civil (railway) engineer, at that time working as an assistant and later a chief of the investigations department of Norwegian State Railways in Kristiania […]

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Computometer

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History of Computers and Computing, Calculating tools, Gadgets, Computometer The Computometer of William George Cordingley The Englishman William George Cordingley, the author of several books for commerce and stock exchange from the end of 19th and beginning of 20th centuries, was a holder of 2 British patents—№GB190715435 from 24.10.1907 (see the lower patent drawing) and […]

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Gilbert Chapin

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Adding Machines of Gilbert Chapin The American Gilbert W. Chapin (see biography of Gilbert W. Chapin) is a holder of three quite interesting patents for calculating machines—US patent №99533 and US patent №106999 from 1870, and US patent 646599 from 1900. He is a holder also of several other patents, e.g. for bird-cage screen (US186711), […]

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George Calder

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George Calder In 1895 George Calder Jr. (1830-1897), a prominent businessman and inventor of Lancaster, Pennsylvania, obtained a patent for cash register and indicator (US patent 543980). Let’s examine in short the calculating machine of George Calder, using the patent drawing (see the image below).

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The Calcumeter, an ad from 1904

Calcumeter of James J. Walsh Explained – Everything You Need To Know

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When we picture calculators, we picture a device that almost resembles a cell phone or a TV remote: thin, tall, not very wide, and a series of useful keys and buttons to help users make every kind of calculation imaginable. It hasn’t always been this way, though. In the early days of the 20th century, […]

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Burridge and Marshman & The Typewriter (Complete History)

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Burridge and Marshman & The Typewriter (Complete History) Lee Burridge (left image) and Newman Marshman (right) Burridge and Marshman Lee Burridge (biography of Lee Burridge) and Newman Marshman (biography of Newman Marshman) were inventive geniuses and manufacturers, primarily known as typewriter inventors. In early 1890s they devised and patented two adding machines (patent US513452 for […]

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David Carroll

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David Carroll On May 2, 1876, David Carroll of Spring Creek, Pennsylvania, took out a US Patent №176833 (see the lower image of the patent drawing) for an adding-machine. The device obviously never went into production, and only the patent model survived to the present time (property of Smithsonian National Museum). The machine is made […]

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Centigraph Adding Machine

Centigraph Adding Machine Explained – Everything You Need To Know

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5 Facts about Centigraph Adding Machine The Centigraph is an adding machine that goes back to 1880. The inventor of the Centigraph Adding Machine was Arthur E. Shattuck. Arthur E. Shattuck got 1 Canada and 4 USA patents for calculating devices. Centigraph Adding Machine was 15.3 cm long, 20.6 cm wide, and 15 cm high. […]

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Brown

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History of Computers and Computing, Calculating tools, Gadgets, Brown George Brown’s Rotula Arithmetica George Brown (1650-1730) is a Scottish arithmetician and minister, known for the invention of an arithmetical instrument, called Rotula Arithmetica—a device for simple addition, subtraction, multiplication, and division. Brown attended Aberdeen’s Kings College, matriculating in 1664 and graduating in 1668. Then he […]

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Jabez Burns

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History of Computers and Computing, Calculating tools, Gadgets, Jabez Burns Jabez Burns’ Addometer On August 24, 1858, Jabez Burns (1826-1888), an inventor from New York (see biography of Jabez Burns), took out the US patent №21,243 for a machine for adding numbers. The device obviously never went into production, and only the patent model survived […]

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Willard Legrand Bundy

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History of Computers and Computing, Calculating tools, Gadgets, Willard Legrand Bundy Willard Legrand Bundy In the end of 1880s Willard Legrand Bundy (1845-1907), an owner of jewelry store in Auburn, New York, (see biography of Willard Legrand Bundy), devised the first electric-cash register in the world. The device was patented in 1890 (US patent Nr. […]

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Viktor Bunyakovsky – Complete Biography, History, and Inventions

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Who was Viktor Bunyakovsky? Viktor Bunyakovsky was a famous Russian mathematician. He was also known as a member and vice president of the Petersburg academy of sciences. The mathematician is acknowledged for his significant contributions to probability and number theories. And in 1859, He was credited for his early discovery of the Cauchy-Schwarz inequality.  Bunyakovsky […]

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The quick and sure reckoner of William Briggs.

William Briggs – Complete Biography, History, and Inventions

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When we think of the arithmetical calculator, we think of a small, rectangular device that can fit in a person’s hand. However, this is our modern-day perspective speaking. As it turns out, this standard design is only a recent innovation — in the early days of the arithmetical calculator, an inventor could try anything they […]

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Borland and Hoffmann adding machine

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History of Computers and Computing, Calculating tools, Gadgets, Borland and Hoffmann adding machine Borland and Hoffmann adding machine In 1878 William Patterson Borland, native of Baltimore, who lived in Leavenworth, Kansas, and Herman Hoffman, a watchmaker in Leavenworth, patented a one-column key adder (see US patent 205993), similar to the earlier Adder of Marshall Cram […]

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Bassett

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History of Computers and Computing, Calculating tools, Gadgets, Bassett Bassett Adder After disappearing from the market of Webb’s Ribbon Adder in the end of 19th century, another similar device appeared with much better market success. The so called Bassett Adder is another continuous band machine and was in production from 1909 till the end of […]

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BriCal

BriCal Explained – Everything You Need To Know

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3 Facts about BriCal The BriCal was invented to quickly calculate pre-decimal British currency up to £500. This popular British calculator came in many different configurations for different maximum results and currencies. There are 12 pence in a shilling and 20 shilling in a pound, which make quick currency calculations difficult without a BriCal. BriCal […]

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Hugues Beaucourt

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History of Computers and Computing, Calculating tools, Gadgets, Hugues Beaucourt Hugues and Edmond Beaucourt On 18 February, 1881, Hugues Beaucourt (1845-1919), a son of the famous organ-builder from Lyon—Hippolyte-César Beaucourt (1822-1888), patented (French patent 141208) appareil pour calculer, an interesting adding device with rotatable (similar to telephone number dial) input mechanism. Hugues Beaucourt succeeded his […]

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Frank Bone

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Frank Bone On 26 October, 1886, Frank A. Bone of Lebanon, Ohio, county surveyor of Warren County, Ohio, patented a column keyboard adder (US patent 351487). Let’s examine the adding machine of Bone, using the patent drawing (see below the drawing). The object of the invention is to provide a new and improved machine for […]

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John Ballou Newbrough

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History of Computers and Computing, Calculating tools, Gadgets, John Ballou Newbrough John Ballou’s Adding Machine On March 13, 1860, a certain John Ballou of Cincinnati, Ohio, took out a US patent №27418, for a calculator. It seems the device never went into production and only the patent model survived to the present, kept in National […]

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Friedrich Arzberger

Friedrich Arzberger — Complete Biography, History, and Inventions

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Who Was Friedrich Arzberger? Friedrich Arzberger was an Austrian engineer and professor. While he wrote several publications for his work on imaginative gravity escapement and served for decades as a professor in mechanical technology, he’s most known for his invention of an adding machine with columns. In 186os, Friedrich Arzberger constructed one of the early […]

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António Júlio de Azevedo Coutinho

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History of Computers and Computing, Calculating tools, Gadgets, António Júlio de Azevedo Coutinho António Júlio de Azevedo Coutinho In the early 1880s, the young Portugal António Júlio Rodrigues de Azevedo Coutinho (1860-1918) devised an interesting key adding device, which he patented in Brasil in 1882, and later in Germany (patent DE30421, 19 August 1884). António […]

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Policarpo de Balzola

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History of Computers and Computing, Calculating tools, Gadgets, Policarpo de Balzola The Teclado Aritmético of Policarpo de Balzola In the middle of 1840s the Basque mathematician and inventor Policarpo de Balzola (1813-1879), from Irún (Guipúzcoa), Spain, (see biography of Policarpo de Balzola) invented his machine Teclado Aritmético (Arithmetic Keyboard)—a calculating machine that had the appearance […]

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